Chunk doesn't loaded when player is approaching

When player is approaching, chunk will be "Waiting for chunk..." in F3 Screen, and player will stuck(unable to move and jump) in the loading chunk when player is standing on it.
And click "F3+A" it only say "[Debug]Chunk reloaded"(Translate from traditional chinese (Taiwan)) then no effect.
You need to reload the map in order to load the chunk.