I have ghost blocks around my world.
just on belts but also very strange ghost blocks
sometimes when i place custom blocks from this modpack they just are gone but the "hitbox" is still there i can mine them but when i open f3 is see by "targeted block" air or empty and when this is happing wit a light block (torches etc.) they wil lit up but not the block alone the particals and the light

sorry for my bad English :)