Using tinyMCE as wp_editor in a custom post type metabox create an alert when I try to submit or If I want to change location

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I don't have such behavior using Quicktags, but since TinyMCE is easier to use I'd like to use it.

I'm aware that using tinymce in a metabox can cause problem since it can't be move inside the dom, but it's not the problem here. I also used the recommended hooks in wordpress codex , ‘edit_page_form’, ‘edit_form_advanced’ and ‘dbx_post_sidebar’ but It doesn't solve my problems


1 Answer 1


This is a bug in WP core 5.6.1:


which will hopefully be fixed by this:


  • I tried this fix but It doesn't seems to resolve the problem
    – DrK
    Feb 18, 2021 at 13:09
  • You can roll back your version to 5.6.0 until this is fixed.
    – tdj
    Feb 18, 2021 at 13:21
  • 1
    I did disable autosave until the fix, ty !
    – DrK
    Feb 18, 2021 at 13:25

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