Tag exists but not appearing/suggested in dropdown

Not sure in which category to post this thread exactly.. (sorry if this is the wrong place)

The issue is as such:

I have recently created the tag Cantarella (Wuthering Waves) and it exists as you can see but when typing the start of the tag to get the suggestions to choose from, the tag does not appear at all. But if you type the tag completely as it is and hit enter, it adds the tag to the wallpaper no problem. And also when searching for the tag in the list of tags, it does not appear there also.

Is this maybe a bug or there is some kind of conflict that occurs when trying to retrieve the tag?

Yes, some tags do not appear in the dropdown suggestion box. That is a bug.

I see, do they also not appear in the list of tags accessible at More > Tags > then searching for the tag?

I think that they appear there.