[meowface]

My understanding is it's always reproducible if you submit the compiler version and flags you used. The (EVM compiler version, flags, source code) tuple should always generate the same bytecode.

(Though I guess it would be hard to imagine how that wouldn't be the case, if you're assuming the same reference compiler is used and that each release, no matter how minor, has a different version. A non-deterministic compiler is probably a bad idea, unless you're trying to make a Malbolge-type language or something.)

In theory perhaps you could discover some major compiler issue where benign-seeming source code generates malicious bytecode for a certain version, and then use that specific version to deploy and verify your contract, but I'm not aware of any such issues. I imagine there would probably have to be an incredibly big fuckup for that kind of bug to occur.