Havnt seen mentioned and hotel not on latest version in honesty but noticed a bug.
One product with single and duo portions
Two order tag groups
Single min 1 max 1
Duo min 2 max 2
mapped to product with portions
If you select duo portion and add 2 different tags then change portion to single one is removed.
If you select 2x same tag and change to single portion the 2x still remains dispite max 1 on group and max 1 on all tags on the single portion mapped.