Steps to reproduce:

1. Start an empty HDRP project
2. Enter playmode
3. Press Ctrl + Backspace to open the Runtime Debug menu
4. Switch to Display stats, observe no stats are updated
5. Switch to any other tab and toggle any property (Probe Volumes -> Display Cells for example)
6. Switch back to Display Stats and observe how counters start to update correctly

Actual results: Display stats are starting to update only after interacting with any other debugger property

Expected results: Display stats are working correctly immediately after Debugger window is opened

Notes:

• Reproduces both in Editor and Built player
• Reopening Debugger window, resets the issue again

Reproducible with versions: 6000.5.0b2, 6000.6.0a3

Not reproducible with: 6000.5.0a6

Could not test with: 6000.5.0a7 (Runtime Debug menu opens up as an empty window and an "InvalidOperationException: Collection was modified; enumeration operation may not execute" error is logged), 6000.5.0a8 (Runtime Debug menu opens up with Probe Volumes tab selected), 6000.5.0a9, 6000.5.0b1 (Runtime Debug menu does not open after Step 3. Performing Step 3 again logs the following error: "NullReferenceException: Object reference not set to an instance of an object")