Problems with sensitivity in the new launcher

In the old launcher, I had no problems with sensitivity. Now with the new launcher, when I turn the mouse a little and it gives about twenty 360 °. This is terrible in pvp, parkour, survival.
I went back to the old launcher and it did not happen. I've tried it on other games, and it's normal. What to do?

What I expected to happen was...:
I hope they solve that.

What actually happened was...:
Bug on sensitivity.

Steps to Reproduce:
1. Update the launcher
2. Open the launcher
3. Run the game
4. Build a new map
5. Join in the world
6. Move the mouse