How to reproduce:
1. Open the “IN_67365” project
2. In the Project window search for the “Player” prefab and open it
3. In the Hierarchy expand the “Player” GameObject and select “Hips“ GameObject
4. Enter and exit the Play Mode
5. In the Inspector enable “ArticulationBody/Immovable“

Expected result: Player doesn’t crash
Actual result: Player crashes

Reproducible with: 2021.3.34f1, 2022.3.19f1, 2023.2.8f1, 2023.3.0a16
Not reproducible with: 2023.3.0b5
Fixed in: 2023.3.0a17

Reproducible on: Windows 10 Pro, macOS Ventura 13.5.2 (M1)
Not reproducible on: No other environments tested

Note: 4 and 5 steps could be reproduced differently so if the issue doesn’t reproduce try entering the Play Mode, toggling the Immovable setting the the Inspector, exiting the Play Mode and repeating this a couple of times

First lines of the Stack trace:

{noformat}#0 0x000001053b0ad4 in physx::PxArticulationImpl::wakeUpInternal(bool, bool)
#1 0x00000103098d34 in Unity::ArticulationBody::SetImmovable(bool)
#2 0x00000103098054 in Unity::ArticulationBody::AwakeFromLoad(AwakeFromLoadMode)
#3 0x000001032e74bc in AwakeFromLoadQueue::InvokeAwakeFromLoad(AwakeFromLoadQueue::Item*, unsigned int, AwakeFromLoadMode)
#4 0x000001032e7244 in AwakeFromLoadQueue::AwakeFromLoadAllQueues(AwakeFromLoadMode, bool)
#5 0x000001041c7d7c in SerializedObject::ApplyModifiedPropertiesWithoutUndo(){noformat}