Hi,
this is a bug that I saw with other plugins that create conflicts.
As that method expect an array from WordPress docs: https://developer.ww.wp.xz.cn/reference/hooks/dashboard_glance_items/
And code of the library: https://github.com/Mte90/extended-cpts/blob/develop/src/class-extended-taxonomy-admin.php#L63
So there is something in your website that alter that. I suggest disabling some plugins and if the error is gone.
I searched in our ticket system and a plugin that was creating this issue was publishPress Revisions, are you using it?
Talking with the users was custom code that wasn’t working in the bad way.
Yep, we had a custom call to dashboard_glance_items that wasn’t returning a value. Our mistake, but thanks for pointing us in the right direction!