installkernel with PORTS_MODULES+=graphics/drm-515-kmod stopped working

I build{world,kernel} on one machine but install
everything from the target machine, with /usr/obj
and /usr/src from the build machine nfs mounted.
/etc/src.conf (on target and build machines) has
PORTS_MODULES+=graphics/drm-515-kmod to build
this port at the same time. This used to work at
least until Nov 1, 2023 but now stopped working.

What I don't understand is why is install trying
to install to /usr/obj/..., which is really on
the build tree.

It this known? Is this style of building .ko ports
still supported?

The make infrastructure has gotten far too complicated
and baroque over the years so before diving into it
I am looking any shortcuts! Thanks!

[note: /usr/ports is mounted from the build machine
/usr/src is symlinked to /home/FreeBSD/stable-14
/etc/src.conf is the same on both machines.
From target (as root) I can create root owned files
under /usr/obj on the target]

===>   drm-515-kmod not installed, skipping
===>  Staging for drm-515-kmod-5.15.118_2
No name and/or group mapping for uid,gid:(0,0)
No name and/or group mapping for uid,gid:(0,0)
...
No name and/or group mapping for uid,gid:(0,0)
===>   Generating temporary packing list
===> dmabuf (install)
install -T release -o root -g wheel -m 555   dmabuf.ko /usr/obj/home/FreeBSD/stable-14/amd64.amd64/sys/GENERIC/usr/ports/graphics/drm-515-kmod/work/stage/boot/modules/
===> ttm (install)
install -T release -o root -g wheel -m 555   ttm.ko /usr/obj/home/FreeBSD/stable-14/amd64.amd64/sys/GENERIC/usr/ports/graphics/drm-515-kmod/work/stage/boot/modules/
===> drm (install)
install -T release -o root -g wheel -m 555   drm.ko /usr/obj/home/FreeBSD/stable-14/amd64.amd64/sys/GENERIC/usr/ports/graphics/drm-515-kmod/work/stage/boot/modules/
No name and/or group mapping for uid,gid:(0,0)
install: /usr/obj/home/FreeBSD/stable-14/amd64.amd64/sys/GENERIC/usr/ports/graphics/drm-515-kmod/work/stage/boot/modules/drm.ko: chown/chgrp: Operation not permitted
*** Error code 71

Stop.
make[6]: stopped in /usr/obj/home/FreeBSD/stable-14/amd64.amd64/sys/GENERIC/usr/ports/graphics/drm-515-kmod/work/drm-kmod-drm_v5.15.118_3/drm
*** Error code 1

Stop.
make[5]: stopped in /usr/obj/home/FreeBSD/stable-14/amd64.amd64/sys/GENERIC/usr/ports/graphics/drm-515-kmod/work/drm-kmod-drm_v5.15.118_3
*** Error code 1