Is replication a big problem in computer science?

If anything, I'd think replication has gotten easier with the advent of open source and the expectation that top papers will include git repos which make it easy to reproduce. The advent of docker, locked-version-dependencies etc have all contributed as well. 10-20 years ago, we didn't have this - but I also didn't see * widespread * problems even then: if someone published a result saying that technique <x> led to <y> performance gain, I thought it usually did?

(that said, computer science research doesn't have the same money on the line as medicine and the "perish" part of the publish-or-perish equation isn't the same when the fallback for failed academics is still six figure salaries at tech companies)