Some more info on this bug:
- Happens since the release of creative 1.0 like 6 years ago.
- All maps that have players joining and leaving during runtime are affected, so almost all maps.
- It is also very common. It is most common in 1v1 maps where it is very likely the running game will have 0 players in it and someone joins
My affected map: 7950-6306-4857
Video of the bug: https://youtu.be/ZGkj1Liv8Zs