I was able to join the adjusted copy with no issues, I spawned at 329, 64, -254, which seems to be my spawn point, either from my bed or a friend set it as my custom spawn point. Unfortunately we've already loaded a backup of the realm and kept playing on it from there, but nevertheless thank you so much for your help and I do hope the info gathered from this is able to contribute to a permanent solution to the bug.
I tried joining the Copy World before and after lowering anti-aliasing to 1, no luck.
My character should be in Survival mode. I can't remember specifically , but my character should have had full Iron armor on, A Diamond Sword, Iron Pickaxe, Iron Axe, and a Diamond Pickaxe, it's also likely that I had both Spruce and Dark Oak wood in my inventory, I could have also been using Steak as food. My Experience Level should have been between 19 and 25 (If I remember correctly it was 22.) As for my last coordinates, I do not have an exact number, I wish I did, But I can say that if you go to 330, 64, -240, you will be on an island with Mangrove trees, a little Mangrove Shack, and a Ship. The Ship is my home, so it's more than likely that I was on the Ship when I logged off, but I know for sure I was somewhere within the confines of that island.
I know for a fact I did not have a Map in my offhand, as I rarely use maps if I'm not exploring. I'm not exactly sure what a motion key is, so I can't answer that.
I hope my info was helpful, I feel that I should mention that when we successfully saved a Copy of the world, I tried to join it as a multiplayer world so I could figure out my exact coordinates, but the issue actually persisted in the multiplayer world which was a surprise to me, so I suppose that means the issue isn't exclusive to realms, even If the issue can only be created in a realm.
My bad, how would I go about Editing it to remove the info?
Started having this issue today as well, the game worked just fine yesterday. I've tried reinstalling Minecraft several times, even tried the msi launcher and cleared my login tokens, every time it gives me the Invalid session error. the msi launcher didn't do it but every other time it told me that my Launcher and Microsoft store accounts were different (they aren't.)