Blocks Disappearing

Hey, DaBoiye here. I am just posting this because of a bug. I noticed it a long time ago but I assumed it was common and about to be fixed, but It hasn't been. here's the problem. (I have only noticed this in multiplayer) when placing blocks, a chunk about 15x15x50 just disappears. so if I am standing on those blocks I fall through them. however, the dirt is still underneath so I don't fall through the ground. and it is easily fixed, just place a block beside the gaping hole and all the blocks pop back into place. this is very annoying when building a skyscraper.