🐛 Bug Report: Scaffolding - empty item in selectbox for enum is not visible

[Vity01]

📜 Description

Although the enum property in the model is nullable and not required, empty value for selection is missing.

Nowadays there is no easy way for user to deselect already selected value. We use 'blank space' as an empty item and it's barely visible and also it's not a perfect engineering solution.

            cto-team:
              ui:emptyValue: ''
              nullable: true
              allowEmptyValue: true
              enum:
                - shared
                - ega
                - infra
                - hippo
                - cbs
                - tlp
                - tis
                - ti

In Backstage:

In RJSF demo

I have no idea where the bug is coming from. It seems the BS is using almost the latest version of RJSF.

👍 Expected behavior

There should be nullable selection item visible for not required fields.

👎 Actual Behavior with Screenshots

Posted above.

👟 Reproduction steps

Create a simple template with enum field.

📃 Provide the context for the Bug.

No response

🖥️ Your Environment

yarn run v1.22.19
$ C:\develope\bsnew\avast-backstage\node_modules\.bin\backstage-cli info
OS:   Windows_NT 10.0.19045 - win32/x64
node: v18.19.0
yarn: 1.22.19
cli:  0.26.3 (installed)
backstage:  1.26.1

Dependencies:
  @backstage/app-defaults                                          1.5.4
  @backstage/backend-app-api                                       0.7.0
  @backstage/backend-common                                        0.21.7
  @backstage/backend-defaults                                      0.2.17
  @backstage/backend-dev-utils                                     0.1.4
  @backstage/backend-openapi-utils                                 0.1.10
  @backstage/backend-plugin-api                                    0.6.17
  @backstage/backend-tasks                                         0.5.22
  @backstage/catalog-client                                        1.6.4
  @backstage/catalog-model                                         1.4.5
  @backstage/cli-common                                            0.1.13
  @backstage/cli-node                                              0.2.5
  @backstage/cli                                                   0.26.3
  @backstage/config-loader                                         1.8.0
  @backstage/config                                                1.2.0
  @backstage/core-app-api                                          1.12.4
  @backstage/core-compat-api                                       0.2.4
  @backstage/core-components                                       0.12.5, 0.13.10, 0.14.4
  @backstage/core-plugin-api                                       1.9.2
  @backstage/dev-utils                                             1.0.31
  @backstage/e2e-test-utils                                        0.1.1
  @backstage/errors                                                1.2.4
  @backstage/eslint-plugin                                         0.1.7
  @backstage/frontend-plugin-api                                   0.6.4
  @backstage/integration-aws-node                                  0.1.12
  @backstage/integration-react                                     1.1.26
  @backstage/integration                                           1.10.0
  @backstage/plugin-analytics-module-ga4                           0.2.4
  @backstage/plugin-api-docs                                       0.11.4
  @backstage/plugin-app-backend                                    0.3.65
  @backstage/plugin-app-node                                       0.1.17
  @backstage/plugin-auth-backend-module-atlassian-provider         0.1.9
  @backstage/plugin-auth-backend-module-aws-alb-provider           0.1.9
  @backstage/plugin-auth-backend-module-azure-easyauth-provider    0.1.0
  @backstage/plugin-auth-backend-module-bitbucket-provider         0.1.0
  @backstage/plugin-auth-backend-module-cloudflare-access-provider 0.1.0
  @backstage/plugin-auth-backend-module-gcp-iap-provider           0.2.12
  @backstage/plugin-auth-backend-module-github-provider            0.1.14
  @backstage/plugin-auth-backend-module-gitlab-provider            0.1.14
  @backstage/plugin-auth-backend-module-google-provider            0.1.14
  @backstage/plugin-auth-backend-module-microsoft-provider         0.1.12
  @backstage/plugin-auth-backend-module-oauth2-provider            0.1.14
  @backstage/plugin-auth-backend-module-oauth2-proxy-provider      0.1.10
  @backstage/plugin-auth-backend-module-oidc-provider              0.1.8
  @backstage/plugin-auth-backend-module-okta-provider              0.0.10
  @backstage/plugin-auth-backend                                   0.22.4
  @backstage/plugin-auth-node                                      0.4.12
  @backstage/plugin-auth-react                                     0.1.0
  @backstage/plugin-catalog-backend-module-github                  0.6.0
  @backstage/plugin-catalog-backend-module-ldap                    0.5.33
  @backstage/plugin-catalog-backend-module-openapi                 0.1.35
  @backstage/plugin-catalog-backend-module-scaffolder-entity-model 0.1.15
  @backstage/plugin-catalog-backend-module-unprocessed             0.4.4
  @backstage/plugin-catalog-backend                                1.21.1
  @backstage/plugin-catalog-common                                 1.0.22
  @backstage/plugin-catalog-graph                                  0.4.4
  @backstage/plugin-catalog-import                                 0.10.10
  @backstage/plugin-catalog-node                                   1.11.1
  @backstage/plugin-catalog-react                                  1.11.3
  @backstage/plugin-catalog-unprocessed-entities-common            0.0.1
  @backstage/plugin-catalog                                        1.19.0
  @backstage/plugin-devtools-backend                               0.3.3
  @backstage/plugin-devtools-common                                0.1.9
  @backstage/plugin-devtools                                       0.1.13
  @backstage/plugin-entity-feedback-backend                        0.2.14
  @backstage/plugin-entity-feedback-common                         0.1.3
  @backstage/plugin-entity-feedback                                0.2.17
  @backstage/plugin-events-node                                    0.3.3
  @backstage/plugin-explore-common                                 0.0.2
  @backstage/plugin-explore-react                                  0.0.38
  @backstage/plugin-explore                                        0.4.20
  @backstage/plugin-github-actions                                 0.6.15
  @backstage/plugin-home-react                                     0.1.12
  @backstage/plugin-home                                           0.7.3
  @backstage/plugin-org                                            0.6.24
  @backstage/plugin-permission-backend                             0.5.41
  @backstage/plugin-permission-common                              0.7.13
  @backstage/plugin-permission-node                                0.7.28
  @backstage/plugin-permission-react                               0.4.22
  @backstage/plugin-proxy-backend                                  0.4.15
  @backstage/plugin-scaffolder-backend-module-azure                0.1.9
  @backstage/plugin-scaffolder-backend-module-bitbucket-cloud      0.1.7
  @backstage/plugin-scaffolder-backend-module-bitbucket-server     0.1.7
  @backstage/plugin-scaffolder-backend-module-bitbucket            0.2.7
  @backstage/plugin-scaffolder-backend-module-gerrit               0.1.9
  @backstage/plugin-scaffolder-backend-module-gitea                0.1.7
  @backstage/plugin-scaffolder-backend-module-github               0.2.7
  @backstage/plugin-scaffolder-backend-module-gitlab               0.3.3
  @backstage/plugin-scaffolder-backend                             1.22.4
  @backstage/plugin-scaffolder-common                              1.5.1
  @backstage/plugin-scaffolder-node                                0.4.3
  @backstage/plugin-scaffolder-react                               1.8.4
  @backstage/plugin-scaffolder                                     1.19.3
  @backstage/plugin-search-backend-module-catalog                  0.1.22
  @backstage/plugin-search-backend-module-elasticsearch            1.4.0
  @backstage/plugin-search-backend-module-pg                       0.5.26
  @backstage/plugin-search-backend-module-stack-overflow-collator  0.1.10
  @backstage/plugin-search-backend-module-techdocs                 0.1.22
  @backstage/plugin-search-backend-node                            1.2.21
  @backstage/plugin-search-backend                                 1.5.7
  @backstage/plugin-search-common                                  1.2.11
  @backstage/plugin-search-react                                   1.7.10
  @backstage/plugin-search                                         1.4.10
  @backstage/plugin-shortcuts                                      0.3.23
  @backstage/plugin-stack-overflow-backend                         0.2.21
  @backstage/plugin-stack-overflow                                 0.1.29
  @backstage/plugin-tech-insights-backend-module-jsonfc            0.1.49
  @backstage/plugin-tech-insights-backend                          0.5.31
  @backstage/plugin-tech-insights-common                           0.2.12
  @backstage/plugin-tech-insights-node                             0.6.0
  @backstage/plugin-tech-radar                                     0.7.3
  @backstage/plugin-techdocs-backend                               1.10.4
  @backstage/plugin-techdocs-module-addons-contrib                 1.1.9
  @backstage/plugin-techdocs-node                                  1.12.3
  @backstage/plugin-techdocs-react                                 1.2.3
  @backstage/plugin-techdocs                                       1.10.4
  @backstage/plugin-user-settings                                  0.8.5
  @backstage/release-manifests                                     0.0.11
  @backstage/repo-tools                                            0.8.0
  @backstage/test-utils                                            1.5.4
  @backstage/theme                                                 0.2.19, 0.4.4, 0.5.3
  @backstage/types                                                 1.1.1
  @backstage/version-bridge                                        1.0.8

👀 Have you spent some time to check if this bug has been raised before?

• I checked and didn't find similar issue

🏢 Have you read the Code of Conduct?

• I have read the Code of Conduct

Are you willing to submit PR?

Yes I am willing to submit a PR!

[benjdlambert]

@Vity01 looked at this in the SIG today, and it looks like this is an upstream issue. When you change the theme to material-ui or mui you get the same issue. There's no empty select box in the material themes. Can you raise this issue with https://github.com/rjsf-team/react-jsonschema-form?

[Vity01]

I created rjsf-team/react-jsonschema-form#4197