I have a minecraft server that was recently updated to 1.15.2 and now I have random chunks that reset upon reconnecting as the player.
I was strip mining and I noticed that certain chunks keep reseting when I log in and come back, but this only happens further out.
Are you running any mods or plugins?
I run a Minecraft Hosting Service
Top Notch MC Hosting - https://store.topnotchmchosting.com/`