It's nearly guaranteed, even if it is just because customers had to work around the bug in such a way that their flow now breaks when the bug is gone.
Obligatory: https://xkcd.com/1172/
Obligatory: https://xkcd.com/1172/
It isn't actually possible for fixing a bug to break a workaround. The point of a workaround is that you're not doing the thing that's broken; when that thing is fixed, your flow won't be affected, because you weren't doing it anyway.
That's not true. For instance, if there's a bug in formatting, that might be worked around by handing the unintended formatting. But now you're (maybe) not handling the intended formatting, and a fix would break you.
Maybe it's a bad workaround, but your users will almost certainly implement bad workarounds.