Mount Failed importing ext2fs disk on TrueNAS Core

[DTM]

When I try to import an ext2fs disk (using the GUI) on TrueNAS-12.0-RELEASE, I get a FAILED message "Mount failed (exit code 1): mount: /dev/da8s1: Invalid argument".

Under More info..., I see:
Error: Traceback (most recent call last): File "/usr/local/lib/python3.8/site-packages/middlewared/job.py", line 361, in run await self.future File "/usr/local/lib/python3.8/site-packages/middlewared/job.py", line 397, in __run_body rv = await self.method(*([self] + args)) File "/usr/local/lib/python3.8/site-packages/middlewared/schema.py", line 973, in nf return await f(*args, **kwargs) File "/usr/local/lib/python3.8/site-packages/middlewared/plugins/pool_/import_disk.py", line 53, in import_disk async with await self.middleware.call('pool.import_disk_mount_fs_context_manager', device, src, File "/usr/local/lib/python3.8/site-packages/middlewared/plugins/pool_/import_disk_freebsd.py", line 96, in __aenter__ await mount(self.device, self.path, *self.args, **self.kwargs) File "/usr/local/lib/python3.8/site-packages/middlewared/plugins/pool_/import_disk_freebsd.py", line 54, in mount raise ValueError("Mount failed (exit code {0}):\n{1}{2}" .format( ValueError: Mount failed (exit code 1): mount: /dev/da8s1: Invalid argument

I was able to import this disk successfully under previous versions of FreeNAS.

Any help much appreciated.

Thanks.

 

[DTM]

In case anyone else has this issue, upgrading to 12.0 U1 fixes it.