Mobs aren't spawning in my Minecraft PE Server

I created a new Minecraft PE Server and no mobs are spawning in my server; neither passive or hostile mobs, not even tall grass.
The difficulty is not peaceful and I have restarted the server.
We also spawned in a zombie in the daytime with a zombie egg, but it didn't try to attack us nor did it burn in the sun.
Best Answer
As of April 18, 2015, PocketMine does not support mobs. It does not spawn mobs naturally, you must use a spawn egg, but then it won't move. The developers are working on this feature but until then you will have to wait. PocketMine doesn't spawn anything naturally including all types of mobs, tall grass, and fire**. This applies to all platforms that PocketMine supports.
** Fire doesn't burn the block that it was placed on either.
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Why are mobs not spawning anymore?
On Java, Mobs will not spawn closer than 24 blocks from you, and will despawn if you are further than 128 blocks away. On Bedrock, mobs will despawn if you are further than 54 blocks away.Why are mobs not spawning in my server Aternos?
Your server's difficulty is set to easy. If your server's difficulty is set to easy then mobs won't naturally spawn on your server.How do mobs spawn in Minecraft PE?
When there are multiple players, mobs can spawn within the given distance of any of them. However, hostile mobs (and some others) that move farther than 128 blocks from the nearest player despawn instantly, so the mob spawning area is more-or-less limited to spheres with a radius of 128 blocks, centered at each player.Fighting My FRIENDS With A MOB ARMY! (Minecraft)
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Answer 2
I have the same problem, I was using the leet server hosting app and noticed that with peaceful off and both passive and aggressive mobs weren't spawning. At that time is when I did some research and found out that leet actually uses pocketmine for their servers, because you can choose how you want your server hosted on the android version and change it, but can't on iOS. They are planning to add support in the future. Hope this helped.
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