Accessing PartOperation.ExtentsSize Crashes

[Crab_Wrangler]

Reproduction Steps

In Studio:

=Instance.new'UnionOperation'.ExtentsSize

In Game:

print(Instance.new'UnionOperation'.ExtentsSize)

Note: This only happens with “empty” PartOperations, creating a union with parts in Studio won’t cause a crash if you access ExtentsSize.
This happens with all PartOperations (UnionOperation, NegateOperation, etc.) Does not require print and will crash if you store the ExtentsSize to a variable. (Simply accessing the property crashes)

System Info: Windows 11, Intel i7-8700k, Nvidia RTX 3080

Expected Behavior

Correctly print the ExtentsSize of the UnionOperation/NegateOperation/etc.

Actual Behavior

A crash happens in Studio + Player:

(Crash DMP + logs in private message.)

Workaround

Use PartOperation.Size or use a Model to contain any PartOperations and use Model:GetExtentsSize()

Issue Area: Engine
Issue Type: Crashing
Impact: Moderate
Frequency: Sometimes
A private message is associated with this bug report

[SomeFedoraGuy (octav)]

Can reproduce with:

• UnionOperation
  
  
• NegateOperation
  
  
• PartOperation
  
  

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There is another instance called “PartOperationAsset” but that seems to be an object used internally to save/load solid models.

[APandaPoet (熊熊熊)]

Update: I have a fix for it. Due to winter holiday code freeze, I might not be able to ship it this year. In the meantime, I encourage you to use Size for now to avoid the crash. Sorry for the inconvenience!

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Thanks for reporting! I’ll look into it.

[Crab_Wrangler]

As of the latest Roblox Studio version this is now fixed, thanks above! (Also got pushed before next year so hurray!)