Happens to my brother four states away when he plays on realms on Java edition as well. I'm on Minecraft PE. I just tried to save progress on realms at least ten times. None of it saved. I'm constantly getting disconnected from server. When I do no progress is saved. It happens to my brother as well. I've been disconnected from internet on my end BUT when that happens it saves my progress. I only play on my realm. It really takes the enjoyment out of playing to the point where if it isn't fixed soon, I'll stop playing Minecraft. Thank you for your time. Scott