Put the summary of the bug you're having here

*What I expected to happen was: normal gameplay
Describe what you thought should happen here

What actually happened was: chunks reloaded about every 2 seconds and that causes a massive amount of lag even on 2 chunk render distance.
Describe what happened here

Steps to Reproduce:
1. I do not know. There was a lot of stained glass nearby, some glowstone, and I was on a minecraft realm owned by someone else with one other player in the vicinity who was not experiencing the bug or the owner of the realm. We were in the overworld adjacent to water.