An exclamation point warning use to show up when loading a world from a previous version to a latest version. As of 1.14.3, the exclamation point warning no longer shows up.

How to reproduce in 1.14.2

1. While in 1.14.2 make a new world
2. Quit Game
3. Load 1.14.3
4. Point mouse cursor at a world made in 1.14.2

How to reproduce in 1.14.3

1. While in 1.14.3 make a new world
2. Quit Game
3. Load 1.14.2
4. Point mouse cursor at a world made in 1.14.3