Strange issue with NFS mounted PGDATA on ugreen NAS

When I try to drop a database, PostgreSQL leaves files in the directory 
and does not even try to delete them.

PostgreSQL 16.6, FreeBSD 14.2, PGDATA mounted NFS from UGreen NAS.

Truss of the create/delete attached.

It does NOT seem to happen PG < 16.

Ideas?

-- 
Larry Rosenman                     http://www.lerctr.org/~ler
Phone: +1 214-642-9640                 E-Mail: ler@lerctr.org
US Mail: 13425 Ranch Road 620 N, Apt 718, Austin, TX 78717-1010