looping sound doesn't persist across levels.

I think this is a bug.
I have background music that I want to play across all levels.
I called spawn sound 2D with Persist Across Level checked when the game starts.
It works fine w/o looping but if I check looping in the sound detail panel, it doesn’t persist. It just stops when a level ends.
Is this a bug? or am I doing something wrong?

There’s quite a lot of little ‘wrinkles’ like this in the sound system. Try