Terrain refreshes every few seconds on 1.21 with client view distance higher than VDT

[nuttapillar]

Hi, I was running the latest build of this on a paper 1.21 server. If they had their render distance set to 1 less, the same or higher than the current distance set by VDT, their terrain would frequently flash/refresh. But if they set their view distance to less than 1 lower than VDT, it would run fine.