Mu(4e) doesn't work anymore after nixos-unstable update

I just updated my system after a 3 week vacation and am now realizing that mu4e doesn’t work properly anymore. Specifically, some of my folders contain “junk”. Others seem to work.
Also, nixpkgs seems to contain mu-1.2. However, mu --version outputs version 1.3.5. What’s going on here?

mu was accidentally upgraded to a beta version, this change was then later reverted:

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