Can't delete tag

I have been playing around using tags and tag badges, seems there is one tag i can’t delete or even renaming:

Renaming:
Screen Shot 2020-11-04 at 14.15.42

Deleting:
Screen Shot 2020-11-04 at 14.15.30

Any clues?

Edit: I fixed it using Deleting Unused Tags button, still weird i could not delete it individually.

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