My scripts tend to look a lot like this in that I have a lot of & commands for overlays at one time.
Have you tried changing the @ on the overlay creation command to a & too?
It might just be a temporary problem. I’ve never had any issues with long sections of script using the & command. Only where sometimes I have characters moving and using the THEN command, but rejigging things around usually fixes that.
Also, if it still doesnt work, maybe try adding your overlays to the scene first and just having the positioning in the script e.g.
INT. BLACK - NIGHT with OVERLAY1 with OVERLAY2 etc etc. (You can always code them at the start of the scene to have no opacity so that they dont show up straight away, then up the opacity when you’re ready!)
Also, just a thought, perhaps remove the numbers before the overlay name in the loop infinite times command.
Can’t hurt to try everything!