Mobs not spawning correctly in multiplayer

When joining someone else's Minecraft world, mobs spawn only in range of the player "hosting" the world. For example mob spawners work only when the player hosting is in range of them etc. 

When joining someone else's Minecraft world, mobs spawn only in range of the player "hosting" the world. For example mob spawners work only when the player hosting is in range of them etc. 

Edit: this problem is in MCPE, not BDS. You cannot delete bug reports so this report is still here.