How to reproduce:
1. Create and open a new URP project
2. Open the Render Graph Viewer window (Window → Analysis → Render Graph Viewer)
3. Dock the Render Graph Viewer window next to the Console window
4. Maximize the Render Graph Viewer window (Shift+Space)
5. Close the Editor
6. Reopen the project
7. Press Shift+Space to resize the Render Graph Viewer window
8. Observe the result

Expected result: No errors appear in the Console, and the Game view and Scene view are rendered
Actual result: The Game view and Scene view fail to render, and two exceptions appear in the Console (see notes)

Reproducible with: 6000.0.5f1, 6000.0.54f1, 6000.1.12f1, 6000.2.0b2 (2bdac9ac0d74), 6000.2.0b10
Not reproducible with: 6000.0.4f1, 6000.3.0a2
Fixed in: 6000.3.0a1

Reproducible on: Windows 11
Not reproducible on: No other environments tested

Notes:
- "Exception: Blitter is already initialized." and “ArgumentException: An item with the same key has already been added.” appear in the Console after performing the reproduction steps
- The Render Graph Viewer window can be docked anywhere in the third step. However, the Game view or Scene view must be made visible before the exceptions appear
- Also reproducible in HDRP
- Restarting the Editor (without maximizing the Render Graph Viewer window) fixes the issue