Collisions Groups Editor automatically choose part that not specified

When I create a new group, the part automatically chose for me

I expected that it should not automatically choose for me, but when I press the + button

Roblox Studio, 7/30

Screenshots and videos of the bug;


Steps to reproduce the issue (be minimal, specific, consistent!);
Step 1 : Open The Collision Groups Editor
Step 2: Create A new Group
Step 3: press the group name to check what item is being highlighted

Intel i7-8550U CPU @ 1.8 GHZ, 12 GB, Intel(R) UHD Graphic 620

Bug Repro.rbxl (42.2 KB)
do the step i provide and u will see it

It looks like this happens because the parts of the characters have CollisionGroupId = 1. Was this manually set by you in the project you copied these characters from?

It seems like this property should just be hidden + reworked because it only causes confusion. If groups can be named, what is the benefit of a numerical property at all?

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Yes, I build a house and make the npc in another place, I scripted in another baseplate, then I merge those 2 together.

Because there’s a limited number of collision groups. If it used names instead, and you inserted a model which “overflowed” the amount of available collision groups, what should happen?

@danthemanroblox192

What’s going on here is that when you delete a collision group, it doesn’t clear the collision group ID of the parts that were in that group, so the next time you make a new group, those parts will automatically be in that group.

If you don’t want that behavior, you should explicitly reassign the all the parts in the group you’re deleting to the group that you do want them to be part of before you delete the collision group. The collision group editor can’t put those parts in “no collision group” when you delete the collision group, since parts always have to be in a collision group.

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