A ZFS pool created using 6.12.10 did not migrate from 6.12.14 to 7.0.0 successfully. All 8 ZFS drives are now shown as missing. There are no drives available in the dropdown boxes - hence no apparent way to restore the ZFS pool.
Note that the 8 ZFS drives are housed in a Thunderbolt 4 chassis - and connected to a mini-PC via a Thunderbolt 4 connection. A separate 2-drive SSD pool in a second enclosure connected via USB 4 (using a different chipset) did migrate successfully.
Downgrading back to 6.12.14 restored the ZFS drives - and all functionality returned to normal.
I am upgrading this bug report to "Urgent" - given that migrating to Unraid 7 is apparently not possible. However, downgrading did restore functionality, so "Urgent" may not be appropriate?
The attached diagnostics were captured while running 7.0.0. A separate post below contains diagnostics run after downgrading back to 6.12.14.
unraidnas-in-diagnostics-20250110_0524.zip