Played a bit with the preview. Saw some nice improvements for sure.
I still wasn’t able to import an Inventor assembly file that had sub-assemblies inside it though. This time it throws an error that it failed to import and to view the output log for information, but it didn’t say anything about a cause. Single assembly files still work fine.
Curious if I should resubmit a bug report? I already had one in there from 4.19 and wouldn’t want to double up.