Ok, now I know 🙂
Yep, I never have to make the tick speed that high but it was just a test after looking at this expected bug 😃
I have to buy a better computer 🙂
Oh, and sorry for my bad english, because I'm french 😉
I don't think that because the grass and all other things are affected too, like normal. My FPS are at 60 all of the time.
It's difficult to explain but I don't think it's lag.
Or just a /setblock ~ ~ ~1 minecraft:redstone_block destroy 0
I think it makes the same bug, not tested yet