Could there be a conflict for openlitespeed last update. The memory usage is not counting, it stays at 0 B, which it never has been.
Website however seems to be working. So i guess its a bug.
Are you on 1.693 by chance? Updating my server from DA 1.692 to 1.693 and the service monitor is showing 0 bytes. Adding a drop-in file enabling memoryaccounting to named for testing fixed it for that service.