Editor removes <map> and <area> tags whilst the filter allows the node to display them

I edited this post, using the <code> tag to surround markup examples.

Does this occur on 10.2.1?

Yes my testing has been on 10.2.1

The problem occurs when the tags are defined in 'Source editing' instead of xxx.ckeditor.yml and I don't know of any other options to try to see if that will prevent the editor from deleting the tags. And I have been flushing the cache after making changes.

Possibly the same as 🐛 [10.2 regression] CKEditor 5 breaks when "Source"/Source editing button is added and "Manually editable HTML tags" are specified Needs review ?

Thanks, I've tried editing with the source button removed and it fixes the problem, so it is the same as #3410100: [10.2 regression] CKEditor 5 breaks when "Source"/Source editing button is added and "Manually editable HTML tags" are specified. So you can close this issue and we'll await it to be hopefully fixed at 10.2.2

Shall we close this as a duplicate? 🐛 [10.2 regression] CKEditor 5 breaks when "Source"/Source editing button is added and "Manually editable HTML tags" are specified Needs review is an open issue.

Thanks for confirming, closing this as duplicate, please follow progress over there to get this fixed.