The new tag your giving it is nil, so I'm guessing that's where your problem is located. When I tried to :Tag() :Untag() and :Tag() it worked fine at least.
You did however locate a little issue, which is that oUF didn't remove the :UpdateTag() function when you :Untag'd a fontstring.
I haven't had time to look at your concept yet, but I guess I will later today.
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