For instance, you can run print(game.CollectionService) in the command prompt to prove that CollectionService exists. You can then click on the link in the console to bring up the Properties panel for CollectionService, but no item will show as being selected within the explorer. You can also search for CollectionService in the Filter Workspace bar above the explorer, which is a misnomer, as that searches among the entire game, except CollectionService is not found there.
I am using CollectionService as an example but really this to Debris among others.
Expected behavior
I was expecting to be able to browse CollectionService and all services if Show Hidden Properties in Explorer is enabled. But instead, this setting shows more services, but still not all the ones that exist.