Fixed Falling through map

[BlazonierTheFox]

While I'm uncertain how this happened I do know how to trigger it, so when i jump in the pregame (on skywars at least) when it hits 2 seconds left to start I was falling the last second before the game started, just to found out I glitched through it (I found out 20, minutes ago)
1st picture is me falling down as I jumped
2nd is when the map started and I fell through the blocks
And 3rd one is to show you that im under the map falling into the abyss (luckily the invincibility saved me)