When using motion blur with UDP I'm getting blue artefacts on the quad that holds the player scoreboard. If you add a new quad the artefacts don't appear. If I turn off motion blur under the Main Camera, volume script, the blur also disappears.

Steps to reproduce.
- Open the attached project (unity 2019.3.0b10)
- Open the MainMenu scene
- Play the scene, select Single Event
- NOTICE ISSUE >> When the camera stops blue artefacts appear in the centre of the screen.

Investigation Steps
- Move and resize your viewport.
- NOTICE ISSUE >> the artefact move and resize.

- Find the game object, Center Screen
- Under Center Screen, select Screen
- Add a new Unity quad.
- Match the size and scale of the Screen quad
- NOTICE ISSUE >> The new quad does not have any artefacts.

- Select the main camera
- Disable the motion blur in the volume script
- NOTICE ISSUE >> Artefacts no longer appear

Repro: Unity 2019.3.0b10 URP 7.1.1, 7.1.3 (Linux)
Not repro: Unity 2019.3.0b10 URP 7.1.1 (Windows), Unity 2019.3.0b8 URP 7.1.1 (Mac)