“GROUPINGS” not appearing as groups

[JohanJ]

Maybe a little sidestep. I use minimserver on a synology and I do my tagging in Jriver for mac. I use the grouping tag for classical style periods like Baroque, Romantic etc. I noticed that only in dsf files the grouping didn't show in bubblepnp. When i checked those files in mp3tag jriver seemed to have written the grouping tags to contentgrouping. Easy to repair, so not a big issue. I find it rather strange though.