Windows tag support is pretty basic. It used to be only ID3v2 v2.3 tags meaning Win7 couldn’t even SHOW modern tags. And the ability to handle FLAC tags didn’t exist.
To double check tags get another geek program like MP3TAG or MediaInfo. With products like Picard and MP3TAG there are active people like @outsidecontext making sure that everything possible is supported in a quality utility. And if it is not supported he will drive the spec forward in a sensible way.
Whereas Microsoft aren’t really interested so they just bodge something basic into the OS and then mess it up.
I use Mediainfo as a replacement for Microsoft’s property pages. Integrates into the OS well and shows me much much more detail about a digital file than MS ever could.