If i remove the PlayerStart or Pawn,
after press play game will create
Character Mesh
Makes sense.
if i add a PlayerStart, after i press
Play it create Character Mesh ignoring
the Player Start,
Ensure you have 1 Player Start and no Pawn (which you call character mesh here, I believe)
same thing happen if i add the Pawn in world after i remove
Player Start
This also makes sense.
I created a new map so when i press
Play Character fall undermap
Also makes sense - this could easily happen if you have no Pawn present in the world and no Player Start; the Game Mode will spawn one at 0,0,0 (adjusting locating a bit which it can do) but if that spots is under the map, you’ll fall.