Gutenberg Conflict With Experminatal Disable TinyMCE Feature

[BrookeDot]

Describe the bug

I've been experiencing a bug that was driving me mad and finally was able to replicate it. I was unable to set the "message" field in the plugin's settings. Instead I just saw an empty field.

I was able to set a message with CLI;

~$ wp rsa set-mode message --text="Site is under development, please login"
Success: Site showing message to visitors.

When I started disabling plugin's I disabled Gutenberg and the filed returned:

Looking through the Gutenberg settings I found the "Disable TinyMCE and Classic block" setting. When this setting is enabled the message field does not appear.

Looking at the 's files I found the following:
https://github.com/WordPress/gutenberg/blob/ae7df52f58baf6289c58b5da76a884ff400cfa3f/lib/experimental/disable-tinymce.php#L10-L20

I'm assuming the solution here is to ensure the "Reading" page is set to require the classic editor (or to upgrade the message field to use the Block Editor)

Steps to Reproduce

1. Install Gutenberg
2. Under Gutenberg > Experiences make sure TinyMCE is disabled (checkbox is checked)
3. Make sure RSA is enabled
4. Visit Settings > Reading and notice the missing message field/TinyMCE editor
5. Disable the Gutenberg TinyMCE box (uncheck the box)
6. Notice the settings return for RSA.

Screenshots, screen recording, code snippet

No response

Environment information

Tested on Windows, MacOS (several versions). Firefox, Brave, Edge, etc.

WordPress information

WordPress Version | 6.4
WordPress Multisite | No
WordPress Memory Limit | 512M
WordPress Debug Mode | No
WordPress Debug Log | No
WordPress Script Debug Mode | No
WordPress Cron | Yes
WordPress Alternate Cron | No
Background tasks | Yes

NGINX

PHP 8.2.11

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