If this doesn't resolve for a while, you could try another workaround without touching the ALBUM tag.
In Asset's Rename List, add the line
Code:
album:=(Unknown Album):==
Then restart & refresh all.*
This will replace "(Unknown Album)" with "=". If you would have other unknown albums they will be renamed too of course, so be careful.
This works in Windows at least.
* Since the tags (and file dates) are untouched you need to use "refresh all". With a big library, you could instead edit a tag of the specific album (or just update the file dates) and then use "detecting changes".