Jup especially in chain based figure you create with Props to figure when converting it to a figure and you have Prop names Chain 1 chain 2 Chain 3 it will work in the first instance when you save with integrated Geometry , but as soon as you save it again it will extract the geometry canceling the number code of the space you will be left with only one chain part all others will get lost . I usually name the Groups the way I want to have the bodyparts named , Also because when creating a new figure in the Hirarchy Editor it will not read the Groups it will rename the names from the Props as new groups in that figure..

So even if a static Prop is already Grouped you might wanna merge some , or rename these for your own confort , just by creating a new Group then copy the existing group to your created and then delete the original one , this way you also automatically check if all is grouped correctly.

in addition I usually add a Group that has the whole Prop marked red , as I create a new group I reduce that part to the full group this way I see at the end if i missed polygons as the full group should be zero Polygons when done .