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I don't think this is a bug. I think it is just a case that you have to be careful when calling functions, you actually do call the function. And that it returns what you think it does.
I think the critical point is this:
"It turned our that I forgot to return the decorator and instead got the default None. But my tests didn't warn me about that."
The solution to that is to always have a test that your decorator actually returns a function. That's what I do.