Toby Foster's solution works! I used MCC Tool Chest PE (program for windows 10) and changed it to 1.12.0.28.1, and I was able to then replace the texture pack, load up the world, and then replace the realm with that world. Thanks so much Toby 👍
Having the same problem exact problem. I download the realm world, and can't join. Wouldn't be much of a problem, except we would like to change the texture pack of the world. Tried replacing the downloaded world's texture pack and then putting it into the realm, however it keeps the same texture pack. I've got no idea why this is happening, I don't really care about going into the downloaded realm. I simply want to change the resource pack, although I believe these two problems are somehow intertwined.
Here is the proof
So how do I fix it? Please tell me.
About 2 days ago we got 3 roll backs in the span of 2 hours. This is ridiculous. Just got one now after playing for about 15 minutes.