Fix respawn error due to null location

Closes #11017

patches/server/Optimize-Collision-to-not-load-chunks.patch

@@ -21,7 +21,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
          Vec3 vec3d = dimensiontransition.pos();
  
          entityplayer1.forceSetPositionRotation(vec3d.x, vec3d.y, vec3d.z, dimensiontransition.yRot(), dimensiontransition.xRot());
-+        worldserver.getChunkSource().addRegionTicket(net.minecraft.server.level.TicketType.POST_TELEPORT, new net.minecraft.world.level.ChunkPos(location.getBlockX() >> 4, location.getBlockZ() >> 4), 1, entityplayer.getId()); // Paper
++        worldserver.getChunkSource().addRegionTicket(net.minecraft.server.level.TicketType.POST_TELEPORT, new net.minecraft.world.level.ChunkPos(net.minecraft.util.Mth.floor(vec3d.x()) >> 4, net.minecraft.util.Mth.floor(vec3d.z()) >> 4), 1, entityplayer.getId()); // Paper
          // CraftBukkit end
          if (dimensiontransition.missingRespawnBlock()) {
              entityplayer1.connection.send(new ClientboundGameEventPacket(ClientboundGameEventPacket.NO_RESPAWN_BLOCK_AVAILABLE, 0.0F));