Issues in building and hosting on nginx

[TanyaEleventhGoddess]

I'm trying to deploy mermaid-live-editor on an nginx webserver with these commands:

export MERMAID_DOMAIN="http://server.local/mermaid" DEPLOY=true
yarn install
export version=$(yarn version --patch --no-git-tag-version | grep "New version" | cut -d':' -f 2)
yarn build
yarn run lint
cp .svelte-kit/output/client/* $WEBSERVER_ROOT/mermaid/

Obviously there's an index.html file roughly adapted from view-source:https://mermaid.live code
It loads all the javascript files correctly and there are no 404 errors, but upon loading preload-helper js script the browser reloads the page indefinitely

What could be the issue?

[github-actions]

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