Steps to reproduce the issue

• have a 3rd party component which does not use an access level database table column
• create a tag within this component
• assign a content item to the tag
• create an instance of the "popular tags" module
• create an instance of the "similar tags" module
• check the output

Alternative: update #_ucm_content and set the core_access column to zero. This is exactly what happens if a 3rd party component does not use this column. Possible reason: different access level restriction implementation.

Expected result

I see the 3rd party tag.

Actual result

Popular Tags module: I don't see the tag
Similar Tags module: I see the tag

System information (as much as possible)

Joomla 3.9.15

Additional comments

For the similar tags module this was fixed some years ago: 0416160