Told you that it's a no time pressures project, specially about help, eh. :)
So yes, t'was the confusion player_map_position/player_position, but that being solved, I'm still going back to the same position in my map, when it's not the warp effect. That's strange, one area2D brings me back to the same position, and another brings me back there the first time, then warps back to the scene...
The camera allows me a better range, but I'm still moving the player, and I cannot pin it in the center of my 'hole'(inside an image/sprite covering the map) for minimap... Tried to inverse map and player sprites, but that's buggy, and it's still not pined...
So take your time to think about that, I've got plenty of others things to work on with that project, no hurry eh! :)