Unity does not recognize surround sound driver capabilities and plays audio in stereo

Reproduction steps:
1. Download and open the attached project: "SurroundSoundTest.zip"
2. Enter Play Mode
3. Observe the Console and listen to the recording playing in the background

Expected result: The sound is played in 5.1 surround sound and both Console messages output "Mode5point1"
Actual result: The sound is played in stereo and AudioSettings.driverCapabilites returns "Stereo" while AudioSettings.speakerMode returns "Mode5poin1"

Reproducible with: 2019.4.34f1, 2020.3.25f1, 2021.2.7f1, 2022.1.0b2

Notes:

• Reproduced on Windows and Ubuntu 18.04
• Tested with surround sound capable hardware and appropriate drivers installed
• The same audio file played in the VLC media player, for instance, outputs proper 5.1 surround sound
• Reproduced in Editor and Player
• Another report mentioned the same issue with 7.1 surround sound but only on Linux