I don't have the same issues with initramfs, but maybe this will help to find what script also puts mount.fuse3 into initramfs:Further follow-up: the problem appears to be that something else has already put mount.fuse3 in the initramfs. Replacing the failing line with copy_exec /sbin/mount.fuse3 /sbin || true allows me to create the initramfs, and the system boots, but I doubt it's an optimal solution.
-- With kindest regards, Alexander. ⢀⣴⠾⠻⢶⣦⠀ ⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system ⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org ⠈⠳⣄⠀⠀⠀⠀