Using double tall blocks such as peony, tall grass, rose bush, sunflower, etc. causes any block to dissappear. Having a 1 block high gap between two blocks causes the upper block to disappear when placing these tall blocks, and therefore the upper block disappears. and if blocks are on top of the upper blocks such as torches, signs, etc., destroying specifically the BOTTOM half of tall blocks causes the blocks to float and no block
update is triggered.