So I found this issue
and It's a little pity that this scale model just broken after openfl 8
then I try to replicate this scale mode with latest library
(feel free to grab it and change code)
Because I only tested this in my bare bone game with only one character walking in tilemap, feel free to ask If I forgot anything
also I haven't made change to flixel code like this dev did yet
so your FlxPointer, FlxMouse and FlxCamera may work awkward.