Running os-prober on its own also reveals this seg fault.
❯ sudo os-prober /dev/nvme2n1p1@/efi/Microsoft/Boot/bootmgfw.efi:Windows Boot Manager:Windows:efi /usr/libexec/os-probes/50mounted-tests: line 186: 224295 Segmentation fault (core dumped) grub2-mount "$partition" "$tmpmnt" 2> /dev/null