Deb Haines

There is a similar bug with areas that have lighting glitch, you must actively change a light source (like placing a torch) for the chuck's lighting to reset to what it should be.  It doesn't happen in all chunks but many in one area (outside my base I have about 4 or 5 of them.  

The only workaround is not to live in those spots or make a machine to change the lighting on a timed basis, especially night. 

I play on iPad, on a realm created by Switch user. 

The realm's performance; loading very slowly, issues with invisible walls, too many mobs in areas even in new unexplored areas (especially drowners that do not despawn) and so forth have been increasing over the last few months.  There are only 4 players on this realm, and we do not all play at the same time. 

In one small area in the ocean, there are hundreds of zombie/drowners, add that to the next area and the next, the lag on the switch is crazy slow with screen jittering.  It is impossible to clear out these areas.

The screen jittering doesn't happen on the iOS as much unless there are just too many mobs both animals and monsters (which we spend time killing - since it is a survival world).  

We have noticed mobs even in unexplored areas - while that might be a different bug (like falling to death on login), it is seems to be one of the major causes of lag at times. 

thanks. 

I think this is a duplicate of https://bugs.mojang.com/browse/MCPE-38374