modules/media/js/plugins/drupalmedia/plugin.js automatically turns the media caption editable in CKE.
But in our case we don't want that because we don't want to allow users to provide an embed-specific caption (and if they enter one, it will not be used in front-office).
figcaption HTML tag in its template.There should be a setting in the text format to disable this behaviour.
JS is not my forte but I can try to submit a patch.
Needs work
10.1 ✨
Last updated
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
With CKEditor 5, included in Drupal 10 core, it looks like media caption is already not editable. CKE4 is unsupported and needs a contrib module.
CKE5 does allow editing captions but only if the "Caption images" filter is enabled.
So site builders can choose if the caption can be edited.