Getting microstutter lag spikes on 1.16.4. Not 100 percent sure if my issue is related to the chunk border issue but I tested 1.12.2 and the microstutter issue wasn't present. On a render distance of 8 it seems to be happening every 12.5 seconds. Tested this with vanilla, forge, badlion client etc. (with Optifine on and off as well). Please fix this @slicedlime
Issue persists on a 1.19 server, and was fixed with a server restart. I think violine1101's hypothesis that the bug only happens if the world is running for a considerable amount of time - case in point, our server which has around 1800 Minecraft days on it. It could very well be the reason why the devs/mods have been unable to reproduce the issue in their worlds, which i assume were newly generated.