Test fails while using archive as source, but works just fine when git is used

I've been migrating XFCE projects from archive-based source to Git-based source, including the catfish package expression, and out of curiosity, I wanted to check if the tests were really that broken in Guix to the point of disabling it.

As it turns out, they work when the source is git-based, and not when it is an archive. Very similar to the issue I had caught earlier in Thunar, where the builds weren't reproducible between archive and git-based approach.