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I can reproduce this most easily if I run a command like:
 clean.cmd & run.py
where clean.cmd is any short batch script and run.py is a file containing only the '#! python3' shabang line.
The batch script in front is not necessary, and I've originally been reproducing the issue without it, but the problem seems much easier to reproduce with it, most likely because is slightly delays the Python startup and thus makes it easier for the Ctrl-C signal to kick in early enough during Python startup.