The following reason prevents CKEditor Media Embed plugin from being uninstalled:
Provides a filter plugin that is in use in the following filter formats: Full HTML
I can see the Media Embed and Symantic Media Embed buttons as available, not active.
How do I remove these buttons so that I may uninstall this module?
Closed: cannot reproduce
1.11
Documentation
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It's likely this issue predates Contrib.social: some issue and comment data are missing.