When enter overworld through End Fountain Portal, player takes falling damage and dies. Loot disappears and cannot be found.

I recently defeated the Ender Dragon with a friend on split screen (the Dragon died for the first time in this world, if that has any thing to do with the bug), and we wanted to go to the End Cities. I jumped in the portal back to the Overworld to get supplies, and I died. It said I got falling damage, and when I respawned back at the Stronghold (because of a bed), my loot was not there. No XP, no armor, not even any cobblestone. I went back to world spawn, because I thought you usually went there after jumping into the End Fountain, and the only things there were a few cobblestone blocks (2, I think) and about 20 XP, but that could have been from other deaths. I had a full set of enchanted diamond armor, tools (besides a hoe), a water bucket, and more, including the Dragon Egg before I died.