When TNT is blown up and destroys blocks near water, it will sometimes not update the water

When Tnt was blown up near a water source on our multiplayer server, I expected it to destroy blocks and for the water to start flowing into the holes. What happened is that it destroyed the block, but didn't update the source, causing an air block next to a water block.

To recreate:
1. Have a water source (like a lake) that is 1 deep and at least 2X2 long and wide.
2. Have blocks like sand or dirt that will blow up easily.
3. Light a Tnt near the destroyable blocks, but not in the water.
4. The Tnt will blow up and should destroy the blocks causing an air space that the water will not flow into.