(I am looking at the sound component within its game object, not inside any collection)
any help?
Looks like a bug. I have the Looping checkbox:
Restart and try again. If it’s not working then please try in a new project. If it still doesn’t work then report the issue via Help->Report Issue
Ah, @ragnar.svensson in his infinite wisdom pointed out that you’ve added the .wav file using Add Component from File. You should add a Sound component and let that point to the .wav file.
Thanks Ragnor and britzl! Sorted