Several elements are missing from ckeditor5 Basic HTML

Error message The current CKEditor 5 build requires the following elements and attributes: <br> <p class="note large h2 h3 h4 text-align-left text-align-center text-align-right text-align-justify"> <h1 class="node__title text-align-left text-align-center text-align-right text-align-justify"> <h2 class="text-align-left text-align-center text-align-right text-align-justify"> <h3 class="text-align-left text-align-center text-align-right text-align-justify"> <h4 class="text-align-left text-align-center text-align-right text-align-justify"> <h5 class="text-align-left text-align-center text-align-right text-align-justify"> <h6 class="text-align-left text-align-center text-align-right text-align-justify"> <a class="button" href data-entity-type data-entity-uuid data-entity-substitution> <img class="border display-left display-right" src alt height width data-caption data-align> <* dir="ltr rtl" lang> <cite> <span> <dl class> <dt class> <dd class> <iframe allow allowfullscreen src width height frameborder> <strong> <em> <sub> <sup> <blockquote> <ul> <ol start> <li> <hr> The following elements are missing: <strong> <em> <sub> <sup> <blockquote> <ul> <ol start> <li> <hr> The <img> tag is not yet supported by the Style plugin. <h4 id="summary-steps-reproduce">Steps to reproduce</h4>

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Issue created by @adrianm6254
Comment about 1 year ago →
🇺🇸United States adrianm6254
Comment about 1 year ago →
🇺🇸United States adrianm6254
Comment about 1 year ago →
🇺🇸United States adrianm6254
Comment about 1 year ago →
🇧🇪Belgium wim leers Ghent 🇧🇪🇪🇺
Thanks for the report! This is very likely related to 🐛 Fix → native CKEditor 5 functionality and fix bug in SourceEditingRedundantTagsConstraintValidator that allowed it to slip by Fixed .

Can you please export your filter.format.SOMETHING.yml and corresponding editor.editor.SOMETING.yml and post them here? 🙏
Status changed to Closed: duplicate about 1 year ago8:53am 22 December 2023
Comment about 1 year ago →
🇧🇪Belgium wim leers Ghent 🇧🇪🇪🇺
Duplicate of 🐛 [10.2 regression] CKEditor 5 breaks when "Source"/Source editing button is added and "Manually editable HTML tags" are specified Needs review (which is the oldest). Will investigate and transfer relevant info from this issue, plus credit everyone who contributed here 👍
Comment about 1 year ago →
🇺🇸United States stsharp
We are also seeing Youtube/Video embed using the Media button no longer working. No error seems to be thrown on the page but not video is viewable after saving the page. We have sites we have not upgraded to 10.2 yet and that embed works but on sites with 10.2, video embeds do not save.

The code remains in the page and it looks normal but no video appears when viewing the page. Any others with this issue after 10.2? We just upgraded last night and this was reported by clients almost immediately.
Comment about 1 year ago →
🇺🇸United States adrianm6254
Here are the two files you requested.

Several elements are missing from ckeditor5 Basic HTML

Problem/Motivation

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