Jest test with seedrandom is unpredictable when source code changes, and test fails

I've created a small reproducible test case here: https://github.com/opyate/jest-seedrandom-testcase

When I use seedrandom, I get predictable randomness, as proven by the test (when running it again and again with npx jest).

However, when I add inconsequential code to the test, it fails.

Can anyone shed some light as to why this might happen? And more importantly, how do I configure jest so the test doesn't fail when it changes?

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