So i have this singleplayer world where everything broke when i opened it in the latest snapshot 18w10b. So what broke? Hoppers, droppers, redstone, fences i couldnt even pick up items and the beacon effects wouldn't update to 0:16 sec. So I went back into the snapshot archives and I found out this was still the case in snapshot 17w47b. I read the snapshot page: https://minecraft.net/nl-nl/article/minecraft-snapshot-17w47a
and found out that everything broke in this snap. But I guess the issues are still not resolved as of like 4 months later in 18w10b?
tldr Very slowtickrate(i guess) and redstone stuff not working (updates in game neither such as beacon effects updates) been happening since 17w47b still happening in 18w10b.