Bernhard, could you try to run a git bisect to find the relevant change which broke fsck for you. https://git.kernel.org/pub/scm/utils/util-linux/util-linux.git/log/disk-utils/fsck.c?h=stable/v2.30
There aren't that many changes for fsck. -- Why is it that all of the instruments seeking intelligent life in the universe are pointed away from Earth?
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