I cannot hear anything from the speakers if I remove my headphones from the 3.5mm jack (this is the main issue), and on Windows, I can freely switch between the speakers and headphone jack regardless (“multistreaming” as the driver refers to it), even on my other system, as I stated earlier.
My other system does have working speakers though, so it’s not a huge concern, even if multistreaming does work on Windows and not Linux, again, as I stated earlier. Possibly a bug in pavucontrol (the multistreaming part), but I doubt it.
The main issue is the lack of sound from the speakers at all times on this current system (the same system as in the OP).
Hopefully there’s a fix for this!