Two different pieces of advice (I have no experience with btrfs):
I can't run manjaro-chroot on vm with brtfs filesystem - #2 by brahma
says that manjaro-chroot can’t be used on btrfs
but rather the manual method as, for instance, described in the Arch Wiki.
and then there is this:
mentions a different method.
I don’t know whether either one or which one is correct.
HTH nonetheless!