It would have to be specific. Put it this way: if this was a general bug and the "else" was always omitted, how long would it last before being found and fixed?
Related, if you were to say to me "I found the issue, the compiler isn't correctly handling if/else statements" Then my first thought would be about your medication not about the compiler.
And yet, it happened :)
And the senior engineers at the company looked at it and confirmed it was a compiler bug. Their best guess was that something about that part of the code was putting the compiler in a funny state, causing it to skip that particular `else` branch.
We reported it to Microsoft, but never heard anything back.