I found out the issue for why my realm wont ypload, but I need help.

This is not only a realm issue, but my world will not update to the new nether update. It has all the commands and also spawn_egg 51, but doesnt have new items and blocks such as netherite armor and the new blocks and chains. Because of this, I am not allowed to post it onto realms and it says “error occured”. Please fix this.