@Levi
The main issue seems to stem from the fact that realms doesn't support custom recipes. The reason that it's an big issue is that addons are advertised as working with Realms, with no disclaimer stating that X, Y, and Z modifications don't work, when it's obvious that they don't.
I have the same issue.
I went ahead a did a recording of me following the steps to document the issue. I apologize ahead of time for the length of the video, I wasn't aware that it was going to take 6+ minutes to download a 188 mb file. https://www.youtube.com/watch?v=kBZyhs6j3s4&feature=youtu.be
Followed the steps exactly as listed, in order, on my Windows 10 PC.
The map works in single player but once uploaded to the realm the Marketplace resource packs no longer load. It's only the marketplace packs that aren't loading because Optifine PE and Enhanced Vanilla Shaders are loading properly which I manually applied to the realm by copying it into the maps folder.
Here's some additional steps that I've taken for integrity's sake:
I tried also loading the realm with just Vanilla BDCraft and its HD UI (no shaders or Optifine)
I repeated the steps on my XBox One S and Nintendo Switch and can verify that the Marketplace packs are not loading on those devices as well when logging into the realm.
To further elaborate on the issue, I have 4 packs on my realm (2 of them are Vanilla BDCraft and the HD UI that's included in that pack) but when I join after clearing the cache on the devices it only tells me that I'm downloading 2 world resource packs, those being Optifine and the shaders.
With the shaders and Optifine disabled it no longer says that it's downloading any packs at all, instead it briefly says it's loading resource packs and then jumps straight to joining realm.
I wouldn't hold your breath for a response. There have been numerous reports for this issue and most of them don't even have a response.
It's not just Chroma Hills. Recently switched to Vanilla BDCraft and it's not working on my realm correctly either. It loads on my Windows 10 PC fine but on Switch and Xbox One it's just plain not loading at all. It seems to be affecting only Marketplace resource packs as I'm also running Optifine PE and Enhanced Vanilla Shaders and they are loading fine.
I'm still having this issue almost a month later.
It's crazy to me that we haven't even had a response to this. We're actually paying for a service every single month that, apparently, has been working correctly since the service launched. Addons are not working correctly even though they are advertised as such.
I'm also having this issue. Custom recipes are not working, but the vein miner behavior pack we're using is working. This is pretty annoying and you'd think that we'd at least get some answer considering we're paying these guys monthly for a service that is not working as advertised.
Here is the world I'm having issues with. The mob spawners are located under the base. Both skeletons and zombies are doing it, but the skeleton farm seems to be crashing the game more frequently. http://www.mediafire.com/file/te7m5ivo1lzyvtr/8sA5Xb7RBQA%253D.mcworld/file
Here is a copy of our Realm. Realm Download
Here is a clip of the issue in question The End Crash/Freeze Minecraft Bedrock 1.11.1
This is still happening in 1.19.10