LXC with fuse-overlayfs won't replicate or backup (hangs at freeze)

Hello,

I'm having an issue with my LXC guests using fuse-overlayfs (docker storage): they can't be either replicated (ZFS replication between nodes) nor backed up over my NAS (NFS share).
The freezes freezes and will never resume its frozen state.

I'm runing the latest 7.0 : pve-manager/7.0-11/63d82f4e (running kernel: 5.11.22-4-pve)

Anyone ever came into this ?

Best regards