NFSv4 error operation not supported, then hangs

[grexe]

I was so happy that my NFSv4 shares connected without a hitch, but the joy was not meant to be. I notice some slugginess and issues with deleting files. When trying a normal delete ("move to trash"), I get a Tracker warning that this is not supported and if I want to delete them right away instead. This worked once.

Error in the log was:

KERN: nfs4: NFS Error: Operation not supported
Last message repeated 1 time
KERN: slab memory manager: created area 0xffffffffca001000 (26926)

Then I tried to delete (as in rm) 8 files at once, but that deletion task hung forever, and now the share is also sluggish and folders don't really load anymore, however I can still basically navigate. Log shows:

KERN: nfs4: NFS Error: No such file or directory

Server is a ugreen NAS with TrueNAS SCALE 24.10 on it, Linux 6.6 based. Using NFS v4.1. Haiku latest nightly, hrev58442

Mount line:

mount -t nfs4 -p "192.168.0.117:/mnt/datalake/docs" /boot/home/nessie/docs