Not multiplayer specific, it's a old bug that they have a hard time to fix. Just relog on the server and it will be fixed. You can also just walk towards it, the game will load it. Because it's not like the chunk isn't there, it's just that the game doesn't visually render it. So no danger of falling down.
You could simply reduce your render distance by pressing ESC-Options...-Video Settings...-Render Distance, or you could install Optifine and change chunk loading to Multi-Core or Smooth by pressing ESC-Options...-Video Settings...-Chunk Loading: Default
slash through the madness that shaped our destiny...
