Can not use/change the Default collision group

[ArtemisTheDeer (Artemis)]

Reproduction Steps

Repo steps:
Place: Ultimate Driving - Roblox

• Try to set the collision group of a part using SetPartCollisionGroup on the client to “Default”.
  

In-game:

• Spawn vehicle, then try to exit vehicle - character will be stuck in air/client will show error.

Expected Behavior

I expect it to set the collision group to default.

Actual Behavior

The part collision group does not set to default and throws an error.

Edit: This is breaking our game - we rely on setting collision groups on the client for players; this is causing players to get stuck in the air when entering/exiting vehicles/trying to respawn vehicles.

Issue Area: Engine
Issue Type: Other
Impact: High
Frequency: Constantly
Date First Experienced: 2022-09-13 17:09:00 (-04:00)
Date Last Experienced: 2022-09-13 00:09:00 (-04:00)

[subcritical]

Thanks for the report! We’re reverting the related flag.

Update: It’s flipped.

[ArtemisTheDeer (Artemis)]

Thank you! Will old servers need to be shut down once the flag is flipped?

[subcritical]

No, they should refresh 2 minutes after the flip.

[ArtemisTheDeer (Artemis)]

Thank you for the prompt response w/fixing this!

[FutureFar]

Had the same exact issue happen. Thank god it’s fixed. Our game lost half its players and was heavily effected!