Cannot edit a tag if it exists with same value as a category and vice versa + cannot publish post if an assigned tag exists with same value as a category and vice versa (context: multisite, table sitecategories, global_terms_enabled on)

[digitwebtools]

Dear WordPress experts,

We are experiencing a weird behavior preventing to edit tags / categories and publishing / updating posts. We believe it occurs when global_terms_enabled is on and some tags and categories share the same value.

Our environment:

• WordPress Multisite 5.1.1 (actually, we've been using it and upgrading it for years and years)
• Table sitecategories defined
• In table sitemeta, global_terms_enabled is set to 1

Steps to reproduce:

• Create a new category "My category" THEN
• Create a new tag "My tag" THEN
• Create a new category with the same name of an existing tag, let's say "My tag" THEN
• Create a new tag with the same name of an existing category, let's say "My category"

Now it will break if you do the following:

• Edit the category "My tag" with the name of an existing tag, you'll get "You need a higher level of permission. Sorry, you are not allowed to edit this item."
• Edit the tag "My category" with the name of an existing category, you'll get "You need a higher level of permission. Sorry, you are not allowed to edit this item."
• Create / edit a content and assign the category "My tag" (with the name of an existing tag) or assign the tag "My category" (with the name of an existing category) and you'll get a 403 error with the response

  {"code":"rest_cannot_assign_term","message":"Sorry, you are not allowed to assign the provided terms.","data":{"status":403}}
  

May be related to #46297

Thank you.

Best regards.

Alexandre - DIGIT WEBTOOLS

[digitfpfis]

Dear all,

Do you have any news concerning this issue?

Best regards,

[boonebgorges]

Further investigation suggests that this is the same issue as #46297. Let's move discussion to that ticket.