My system:
Argon Eon with rpi4 with 4 hdd.
I upgraded my OMV6-13.1 to OMV 7-30. Shares created on OMV6 are no longer visible via zerconf of my mediacenter Kodi client. I created a clean installation of OVM-7.30 to understand if the problem was due to an update error, but it returns with a clean installation.
Client and server are set for nfs3, but I tried on the kodi client to set nfs4 but no results. Using OMV6.13.1 everything works fine.
Code
# /etc/exports: the access control list for filesystems which may be exported
# to NFS clients. See exports(5).
/export/FANTA1 192.168.1.1/24(fsid=50c657d9-4fa9-4c70-bb75-229886098a2c,rw,subtree_check,insecure)
/export/Cartoni 192.168.1.1/24(fsid=96b99817-9ed0-4777-bc41-f6337f6193f3,rw,subtree_check,insecure)
/export/Documentari 192.168.1.1/24(fsid=ea5c713b-a6dc-4cb0-b3d0-c8ad64d730f1,rw,subtree_check,insecure)
/export/Musica 192.168.1.1/24(fsid=34fe808b-9789-4f9e-a420-6f83575d7814,rw,subtree_check,insecure)
/export/Foto 192.168.1.1/24(fsid=5c984d50-4d00-4d57-b39f-18e886ecb959,rw,subtree_check,insecure)
/export/torrent 192.168.1.1/24(fsid=f8c8ac8f-97fe-4c6b-b8f3-d238dafde40d,rw,subtree_check,insecure)
/export/home 192.168.1.1/24(fsid=713f189b-4b21-40d0-890e-d777add472b6,rw,subtree_check,insecure)
/export/Film 192.168.1.1/24(fsid=b50dabcd-27a7-44f1-b076-c04a07055256,rw,subtree_check,insecure)
/export/TV 192.168.1.1/24(fsid=4de81a3b-6a69-4933-9255-0727102c9123,rw,subtree_check,insecure)
/export 192.168.1.1/24(ro,fsid=0,root_squash,no_subtree_check)