Stamp doesn't work with FlxBitmapText
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I tested this a few times and it seems that stamping a FlxBitmapText onto a FlxSprite doesn't work. It just crashes the game. FlxText works fine by the way.
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FlxBitmapText isn't exactly the best thing in HaxeFlixel. Even the alpha's bugged.
Speaking of bugs, your problem probably is, and you could try inquiring in GitHub.