Server Authority inconsistent crashing

Bug Reports Studio Bugs
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1

I am experiencing crashing with server authority enabled on a nearly finished game, occasionally (~10% of the time) in Studio and consistently (100% of the time) in Roblox Player.

If I disable server authority properties in Workspace, I never crash on Studio or Roblox Player. While experimenting with debug print statements, I found that the crash is not consistent with any line of code or physical interaction.

System Information:
CPU - Intel(R) Core™ i7-9700F CPU @ 3.00GHz
Memory - 24.0 GB
Disk - ADATA SU635
GPU - NVIDIA GeForce GTX 1650

Expected behavior

Studio/Roblox player should not crash within 15 seconds of joining the server.

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2

It’s difficult to find the root cause of this bug since it occurs inconsistently in my game, but after experimenting some more, I believe the crashing has to do with welding a basepart to a simulated object using a WeldConstraint. I’ll upload a place file with repro steps here if I can find the cause