If a sync load was triggered, it would process pending join events,
causing them to be added to the world in the middle of the entity ticking
process.
This caused their add to be queued instead of immediate, causing
"Illegal Tracking" errors.
This schedules it to fire at the players next Connection Tick, which
is exactly where this entire process use to run anyways.
Also added missing tab complete and syntax for syncloadinfo debug command
This change lets players who are in their bed have a position which is above
ground for a longer period of time. This is because of the server not setting
their position to the ground/exit location when entering the bed, resulting in
the server believing they're still in the air.
