Whenever the events in the lobby start it doesn’t spawn the items sometimes. In the past I’ve had issues where it doesn’t spawn upwards to 8 of the collectibles. Now though sometimes it doesn’t spawn any of them for nearly half the time they are supposed to be up. Most of the time as well it only spawn some of them and I find new ones in areas I’ve searched more than once. A lot of the time it takes the entirety of the event time frame to find all of the items and I still miss 1 or more of them. I have this issue on full lobby servers and on empty servers.
Maybe there could be an item spawn map to show where the items spawn, or possibly an item like the metal detector to tell if you’re near them.