Uzephi
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To clarify: I’ve been using the same pack that I’ve been updating for four years, every major block change that needed PBR bits added got an update. Last update that uploaded successfully to the realm was January of this year.
There is definitely odd behavior with Realms and uploading RP and BP. I have used a custom RT pack for my realm for about 4 years, and just got around to finally changing things and find I cannot add the new pack because the manifest has “raytracing” in it’s capabilities, yet all save states of the realm before trying to update the RP had raytracing in the capabilities. If there are changes like this where you are denying packs, please give us an error or something to follow the steps and find out why a pack that worked 5 months ago now just stops working with a silent error that the user does not see.
OP, yes if you save changes, the pack disappears, at least it does for packs with the “raytracing” capability, like my realm. I can load old states with the RP attached, but if I go into the management menu, the pack is missing and will ask me to save changes. If saved, pack is gone, need to discard to keep it on the realm.
Oh, I forgot, I received the 25H2 update last night and the issue persists in that update as well.
There might be something in the pack that Mojang doesn’t allow on Realms, now. I know they silently are denying any resource pack with ‘raytracing’ in it’s capabilities. Searching for similar bugs to mine got me to this report. I would suggest trying to remove features to see which one isn’t allowed, or link the manifest here and maybe a staff member can pin point what feature they’re silently denying like raytracing.
For context: Raytracing resource packs worked on realms before 26.x I don’t know the exact time and my last updated pack was uploaded sometime early Jan late Dec 2026/25. All versions of that pack for four years was accepted on my realm. No capability changes. Finally update all the baby mobs and such on my pack to find out this silent error. Not only did it not allow the upload, it silently removed the current RP on the Realm.
Your issue might be linked to whatever they are doing to deny packs on realms silently.