I recently hooked up two datasettes to my 8032 PET with built in piezo speaker. I noticed when I load from Datasette 2 (load "",2) that games with built in sound often do not work right (i.e. Space Invaders).
They play fine but there is no sound.

Is this known behaviour?

If loaded from datasette device 1 or the flash SD card device I have the sound plays fine.