So as a user of 6.3 Pro version, I had a library of almost 700MB metadata with icloyd sync on. With the HDR tags on 6.4, I cleared metadata and rescaned my library. The thing is that it kept bringing back the iCloud backup, thus the HDR tags didn’t show. Turning iCloud sync off, clearing metadata and rescaning everything again from scratch solved the issue and I had 1GB of metadata. Turning, iCloud sync on again, caused the metadata count to climb to 2GB for some reason. The artwork or HDR tags are OK but I don’t know what’s going on with iCloud backup or why I got so high metadata count.
The local metadata size is recently going crazy for me too.
Usually it was 1GB all the time, but when I add something to the library (even one tv show episode) it climbs to 2GB.
But, and this is a news, yesterday I add a movie and now the size is…165 MB, impossible.
So it’s definitely broken.