Unreal Engine - Steam Audio reflections not working when playing in Standalone

[elai950]

System Information Steam Audio 4.5.3 Unreal Engine 5.4.4 Windows 11 x64 23H2

Issue Description Expected: When running the game from the UE Editor in a standalone mode, the Steam Audio should be working. No reverb or reflectation sounds at all.

I do found the there's a launch parameter -audiomixer to add, I did but it still doesn't work. When I play in the editor normally it works great, but using the standalone it just doesn't.

I have enabled reverb and occlusion in the attenuation sound file, I must say that sounds seem to be occluded though without reverb. If I'm standing inside a room with a beeping sound, I can hear the sound without the reverb, reflections or any effect. But as I exit the room it occluded and I can't hear the sound at all. I'm trying to figure out if this is saying that the Steam Audio do work? because launching the game in PIE in viewport I do hear all the effects that Steam Audio has to offer. It's like the SteamAudioReverbSettings are turned off, but there are not.

I have enabled validation in settings, and this line only appears in logs when I launch in standalone.

LogSteamAudio: Warning: Warning: setInputs: invalid IPLfloat32: (&inputs->directivity)->dipoleWeight = 0.000000

Don't know if it's related but I throwing any information I can get.

Steps To Reproduce Steps to reproduce the behavior:

1. Launch game in PIE as usual the Steam Audio is working as expected.
2. Launch the game from editor in Standalone mode, the Steam Audio doesn't work.