Specific user cannot select a public tag restricted to a category

I have a user who cannot select some tags. It looks like this:

The problem is that already in the screenshot it says it actually should be possible.

The tag group looks like this:

this is how the category looks like:

Other users CAN select the tags from this group!

This user can select tags from the bug_dev_wf` group, which is configured exactly the same!

These tags are not included in other groups (they were but I deleted them from other tag groups and nothing changed).

The user is a member of the following groups:
trust_level_2, trust_level_3, moderators, staff, trust_level_0, trust_level_1

I am on the latest Discourse (just updated).

לייק 1