Before I posted about a bug that would make player vanish during world bosses, causing them to be invisible walls. Well that still happens from time to time. 

This time, It happened before the boss even spawned.

Hold the Shift key and hit F5. It will give you a message that the Hide Other Players option has been disabled. When that is enabled the game automatically hides other players once there are a whole bunch in the same area, but only when there are enough players in the area to trigger it.

That's not a bug. It helps your potato PC to not die when seeing 100k players.  You would understand how important this function is if you go to Vell. I don't think you would like 100k ships around you.

Additionally, this feature doesn't disable collision, this is why you can still get stuck "by nothing" when it triggers.