I tried several Minecraft marketplace maps on realms playing it together with my son.

Nearly every map produces issues running on realms. When i remember, every pack including behaviour packs i used generated such issues. I think realms + the behaviour packs are not working well together.

The problem is only relevant for realms. I downloaded the worlds and played them locally. And no problems. They behave like they should.

I only used packs from the official marketplace. Here are some examples:

DINOSAURS By Everbloom Games

• During the Game even more and more Dinosaurs were spawning. It seems the spawn cap doesnt work. After some in game days it wasnt playable anymore due to a huge ammount of mobs and slowdown.

Camo Hide & Seek By Cubed Creations

• Using a camo outfit (it's an armor) makes player completly invisible. Not playable this way.

Advanced Creepers By Enchanted

• Triggers while entering the different arenas were not working

Sam & Danni - Episode 2 By Blockception

• Triggers wont work. Important doors are not opening. Plotstoper.

This way realms seems to be completely useless for me. I wanted it to play with my son, but now i have to host nearly every world we play on my local pc. This is very poor.