Hi, for me, removing the commit graph cache with rm -r .git/objects/info/commit-graph{,s} and regenerating with git commit-graph write worked as well. See here https://lore.kernel.org/git/f50e74f0-9ffa-f4f2-4663-269801495...@github.com/ for confirmation that it's indeed just a cache, and upstream noting that git should be fixed to handle a corrupt cache better than dying.
HTH, Jan
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