Norse Mythology Mash-up Not Loading on Realms

Since yesterday (September 8, 2020), whenever I tried to join my Realms, the Mash-up pack I use, Norse Mythology, will not load. 

I have tried loading other worlds, and it works. I've tried loading other texture packs and such on Realms, and they do. It's just that Norse Mythology will not load on Realms right now. Not for me, not for the other players that are on my Realm. 

I've attempted to delete the cache, delete the mash-up and re-install it, etc., and nothing has worked. Thus why I'm posting my first ever bug report.