Missing NACK response in WHIP Simulcast for medium/low layers (HIGH works fine)

[mpisat]

Operating System Info

macOS 15

Other OS

No response

OBS Studio Version

32.1.0-rc1

OBS Studio Version (Other)

No response

OBS Studio Log URL

https://obsproject.com/logs/IWwBCGkdWWllnfAK

OBS Studio Crash Log URL

No response

Expected Behavior

It should respond to NACK requests for all layers, not just HIGH layer

Current Behavior

It responds to HIGH video layer for NACK requests, and ignores lower video layers/resolutions, making 3 layer simulcast video under packet loss frozen for lower quality video tracks.

Steps to Reproduce

1. Publish Simulcast to a WHIP endpoint that accepts Simulcast from OBS
2. Check NACK logs
3. Verify OBS resends lost packets for HIGH video track

Anything else we should know?

Bug is related to #10885