System Information
Operating system: Windows 10 Pro
Graphics card: Zotac 3080 AMP HOLO

Blender Version
Broken: 3.1.0
Worked: 3.0.0

Short description of error
Rigid bodies with constraints have glitched subframes causing motion blur problems

Exact steps for others to reproduce the error
Open the attached file or do the following steps:

1. Duplicate the default cube.
2. Select both cubes and go to Object > Rigid Body > Add Active.
3. With both cubes still selected, go to Object > Rigid Body > Connect.
4. Bake the rigid body simulation.
5. Enable Motion Blur under Render Properties. In Eevee, increasing the steps can better show the trail.

Additional details

• Enabling Show Subframes under the Playback menu and scrubbing shows the glitched animation.
• Opening the file in Blender 3.0 with the same rigid body cache shows normal behavior.

Thanks in advance! ❤️