Confirmed for all Browsers, below for Firefox.

 Uncaught DOMException: Document.querySelectorAll: '#jform_articletext_**Article**Modal' is not a valid selector modal.min.js:1
    <anonymous> http://localhost:8888/sample/joomla40/media/vendor/bootstrap/js/modal.min.js?5.0.0-beta2:1
    forEach self-hosted:206
    <anonymous> http://localhost:8888/sample/joomla40/media/vendor/bootstrap/js/modal.min.js?5.0.0-beta2:1
    InnerModuleEvaluation self-hosted:2379
    evaluation self-hosted:2330

all xtd broken

code produced is
<div id="jform_articletext_**Article**Modal" role="dialog" tabindex="-1" class="joomla-modal modal fade" data-url="http://localhost:8888/sample/joomla40/administrator/index.php?option=com_content&amp;view=articles&amp;layout=modal&amp;tmpl=component&amp;2a78b7e25e9fac793dbf382b91f66d1c=1&amp;editor=jform_articletext" data-iframe="&lt;iframe class=&quot;iframe&quot; src=&quot;http://localhost:8888/sample/joomla40/administrator/index.php?option=com_content&amp;amp;view=articles&amp;amp;layout=modal&amp;amp;tmpl=component&amp;amp;2a78b7e25e9fac793dbf382b91f66d1c=1&amp;amp;editor=jform_articletext&quot; name=&quot;**Article**&quot; title=&quot;**Article**&quot; height=&quot;300px&quot; width=&quot;800px&quot;&gt;&lt;/iframe&gt;">

#jform_articletext_**Article**Modal The ** part that comes from the debug is not valid for an ID. Chenge the part there to skip the debug output for this part of the ID. It's not a JS error it's invalid HTML

Lol - just had a PR rejected for disabling language debug for genuine reasons and you want me to start that fight here too hahah

In this case it is absolutely necessary for that modal part only and it concerns all xtd, not only articles modal. ;)

just had a PR rejected for disabling language debug for genuine reasons and you want me to start that fight here too hahah

If debug language creates invalid HTML then there's a need for a new SPEC compliant implementation. You can't attach random invalid characters to classes,ids, etc and expect that things will continue to work...

Edit also I don't think that an id="jform_articletext_ΆρθροModal" is valid either. The string there should not be translatable AFAIK

In this case, the issue comes from /layouts/libraries/html/bootstrap/modal/main.php

code: <div id="<?php echo $selector; ?>"

In this case, the issue comes from /layouts/libraries/html/bootstrap/modal/main.php

Nope, it's coming from:

Basically the object there needs also a non translated string that will be passed then to the modal as the ID: eg Article instead of **Article**

Or you can use

How do you pass $button->realName to the id?

Please test: #33216

Closing as having a pull request. Please test #33216 . Thanks in advance.

Im getting this error again today @dgrammatiko - right out the box after installation

The string did not match the expected pattern

But only in safari.... even after reinstalling Joomla and re-npm-ing everything :(

Ignore me. My browser had "internally crashed" apparently according to mac, and on posting the comment to this thread the whole browser closed and segfaulted hahahahahahah

Shall I re-open the issue?

Ah ok.

Shall I re-open the issue?

Nope - totally not a problem - dumb safari.