From 0.9.0 to 0.9.0d, placing any type of engine and turning it spawns 247 sounds and nothing is heard, neither the engine nor anything else that emits sound.

Before turning on the engine:

After (it slowly rises to this number)

and then nothing else is heard in the world until you restart the world! if you break/turn off the engine the sounds go down to 246, so some things can be heard but nothing more than a single sound at a time.

Mod versions used:
Create 0.5.1f
Create TFMG 0.9.0 to 0.9.0d
Minecraft 1.20.1
Forge 47.3.0

I'm using Windows 10

Figured it out. Looks like the 1.20.1 branch had the engine sounds missing, I've opened a PR to re-add them :)