Well, in order to verify that we fixed the problem you reported we need to be able to test the fix and see that the problem is gone.  Right now we have two theories of what the cause could be, because there are two known bugs in that area. But you may have stumbled upon an unrelated third bug.

The best scenario is that we close a bpo issue because we can reproduce the bug and see that it has been fixed. When that's not possible, there will come a point where we will close it and say "the code has changed since you observed the problem and we fixed things that could have caused it. Please open a new issue if you still see this bug".

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