Steps to reproduce:

1. Compile and start latest Unity version (Trunk).

2. Download the URP sample project and open the Cockpit scene.

3. Switch from Scene View --> Game View --> Scene View --> Etc.

4. An error is thrown in the console (c.f gif).

Actual results: 
Error is thrown in the console
"Render Graph Execution error"
"Exception: Invalid version: 20"

Expected results: 
No error in the console.

Reproducible with versions: 
Latest Trunk (Latest tested: 6000.0.0b15) + Windows + URP sample.
All settings by default.

Not reproducible with versions: 
Never tested on Linux or macOS.

Notes:
It seems related with the Scene View. The same bug happens for the 3D SkyBox and the Outline effect (using the Fullscreen RenderPass, in the project). 

When only executing the Render Pass for the GameView, it works well (by using the 3D Skybox script in the scene). As soon as I'm adding "Scene View" on the "Camera Type" field, the error pops.