[Runtime Bug]: RTX Remix hangs on startup

Describe the bug

A bug happens where RTX Remix games hang with a black screen on startup.

How do you reproduce the bug?

• Install the latest version of Portal RTX or Portal Prelude RTX.
• Install Nvidia driver version 560.81.
• Replace the existing RTX Remix runtimes with files from dxvk-remix-3c9c2ed-609-debugoptimized and bridge-remix-2d8aa92-87-debugoptimized.
• Launch Portal RTX and/or Portal Prelude RTX.
• Both games hang on startup with a black screen. I terminate the processes after 5 minutes.

(For this issue I'm using the latest driver and CI builds for symbols, but it's reproducible on older 560.XX drivers and older Remix runtimes. This is not exclusive to Portal either.)

What is the expected behavior?

RTX Remix games should reach the main menu after a few seconds.

Version

0.5.4+3c9c2ed9

Logs

hl2_d3d9.log
d3d9.log
NvRemixBridge.log

Crash dumps

NvRemixBridge.dmp
stackdump.txt

Note: this isn't a crash. The attached dump was manually initiated through windbg.

Media

No response

Reproduce the startup hang in Portal RTX or Portal Prelude RTX using the stated driver and runtime versions. Start by reading hl2_d3d9.log, d3d9.log, NvRemixBridge.log, and the manually captured NvRemixBridge.dmp or stackdump.txt. Done means the affected games reach the main menu instead of remaining on a black screen.