Thank you!
This seems to work now. I was able to create UppercaseTag when Force lowercase tags was disabled.

And when I disabled the setting, I was still able to create UppercaseTag, and it was converted to lowercase

Is there a reason why the other magic fixes that happen when I create a tag in the composer are not applied when I use bulk create?
For example, I cannot create a tag with 2 dashes in bulk create

But it works in the composer