UI Toolkit Backdrop Filter Blur is not applied when project is in HDRP

How to reproduce:

1. Open the attached “IN-153404“ project
2. Observe the Game view

Actual result: The “Panel” GameObject is greyed out
Expected result: The “Panel” GameObject is see trough and blurs the view behind itself

Reproducible with: 6000.6.0b1, 6000.6.1f1, 6000.7.0a6
Could not test with: 6000.0.0f1, 6000.0.83f1, 6000.3.24f1, 6000.6.0a7 (Backdrop Filter Blur was not introduced in UI Builder)

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

Notes:

• On version 6000.6.0b1 the “Panel” GameObject is not grayed out but it still doesn’t apply the Backdrop Filter Blur effect only Filter Blur
• When tested on 6000.7.0a6 URP the bug did not reproduce and the blur worked as intended