Players phase through blocks in Minecraft Realms. This appears to happen only when the server is lagging on the server's end. At first this wasn't a problem, it was kinda fun. It would cause some suffocation damage if you stayed in there for too long but nothing super dangerous...until we made our enderman farm and someone fell off of the bridge by phasing through the blocks that protect you from falling off. He was not wearing an elytra, and there was only a one block gap between the protective blocks and the bridge. Now it's dangerous and we want to get this fixed soon  Thanks for reading this report.

The photo is the bridge design (on a singleplayer world that was a copy of the server)