I have also seen this bug many times.

This comment thread strikes me as a good example of an anti-pattern I've seen before, that I don't know a name for (close to, but not exactly, privileging the hypothesis), where a conversation slides without explicit comment from reasonably suggesting a bad-case possibility to taking it for granted for no apparent reason.

(disclaimer: I work for Quixey, conflict of interest and all that, but I'm pretty sure I'd be making this exact same comment if I didn't)