I did not trigger this bug (also could not come up with a test) but just by inspecting the code I thought it's very suspicious.

But I did remove the assert(!exc_state.is_reraise) assert because it got hit in a legitimate case,
(c++ exception got rethrowen in the llvm tier, cought in our c++ code and rethrowen because of api mismatch. With no python code in between.)