The easiest and recommended way would be to wait for a new version of zfsutils-linux to be released - the patch is already applied on master and should be available with the next update to zfsutils-linux.
for building the ZFS packages yourself -...
The fix is in process:
https://lore.proxmox.com/pve-devel/20260310091141.814416-1-d.csapak@proxmox.com/T/#t
https://lore.proxmox.com/pve-devel/20260310091141.814416-1-d.csapak@proxmox.com/T/#m47eaa3b51d88a1ecbb4b21401c6ad834ec9aaaf4...
For now a downgrade of pvemanager to 9.0.12 was the solution. Apparently there is a single line change that invokes a JS feature implemented in Firefox 130+ (hence my ESR115 doesn't work).
ZFS over iSCSI in PVE is a specific scheme that implies:
a) There is an external storage device
b) You can login to this server via SSH as root (this excludes Dell, Netapp, Hitachi, etc)
c) There is internal storage in that server (HDD, SAS...
a SAN would be a shared device of some sort. when you say you have "two" SANs, do you mean you have two boxes serving independent iscsi luns, or two boxes in a failover capacity (meaning one set of luns?)
In either case, this becomes a simple...