Bug/incompatibility on mergerfs/snapraid

i’m using the docker version of urbackup on openmediavault and came across this issue:
when using the ‘database’ folder on my snapraid+mergerfs partition it gives a series of sqlite 5386 errors (sorry i deleted the logs).
i just changed the database folder to a regular ext4 disk, and everything worked fine.

its probably is a sqlite not urbackup bug, but i found no warning about this.