Add Timings to LevelTicks and EntityTickList
Check IBlockDataList#GLOBAL_PALETTE
Check if PlayerNaturallySpawnedEvent is called correctly
Make sure fluids aren't completly fucked, there may be more sync loads to nuke there as well
Improve Server Thread Pool and Thread Priorities: mojang added a max thread count property
Use Vanilla Minecart Speeds: is this needed?
Handle Oversized Tile Entities: make sure impl is correct
0467-Optimize-WorldBorder-collision-checks-and-air check first hunk that has been removed

Not sure where this needs to go, if anywhere
diff --git a/src/main/java/net/minecraft/world/phys/shapes/Shapes.java b/src/main/java/net/minecraft/world/phys/shapes/Shapes.java
index 48812329969b7192acd948db974bb77bb546f979..5b1e0ea40dea6c7d787699ed25160c8b75ab3bf3 100644
--- a/src/main/java/net/minecraft/world/phys/shapes/Shapes.java
+++ b/src/main/java/net/minecraft/world/phys/shapes/Shapes.java
@@ -237,7 +237,8 @@ public final class Shapes {

                             if (s < 3) {
                                 mutableBlockPos.set(axisCycle, q, r, p);
-                                BlockState blockState = world.getBlockState(mutableBlockPos);
+                                BlockState blockState = world.getTypeIfLoaded(mutableBlockPos); // Paper
+                                if (blockState == null) return 0.0D; // Paper
                                 if ((s != 1 || blockState.hasLargeCollisionShape()) && (s != 2 || blockState.is(Blocks.MOVING_PISTON))) {
                                     initial = blockState.getCollisionShape(world, mutableBlockPos, context).collide(axis3, box.move((double)(-mutableBlockPos.getX()), (double)(-mutableBlockPos.getY()), (double)(-mutableBlockPos.getZ())), initial);
                                     if (Math.abs(initial) < 1.0E-7D) {