Put the summary of the bug you're having here

What I expected to happen was...:

Beacon effect should stay permanent until you manually change it

What actually happened was...:
**

Beacon resetting to previous selection randomly

Steps to Reproduce:
1. Make a world in 1.16.2
2. Make a beacon in that world
3. Update the world

4. Select a effect and relog

https://www.youtube.com/watch?v=AwFEHWKvVrw

please watch my video on it, it will help you understand it better

this wont work everytime, so try it again if it doesnt work the first time