What I expected to happen was...:
When I go through the Overworld side of the end portal (in the strong hold) I should be taken to the end a put on an obsidian platform

What actually happened was...:
I was taken to the end, without touching my keyboard or mouse I was somehow teleported through the platform and fell into the void

Steps to Reproduce:
1. Open chest and transfer 4 items while standing on the end portal frame
2. Jump into the portal
3. Die in the void

The realm is in survival mode with cheats activated but only used to move the world spawn to a more optimal location. The only resource/behavior pack is a one player sleep that only requires one player in a bed to skip to day.