They are polishing their
AS3 to Haxe converter which they use to make HTML5 version of their games. Now they seems try to make sure that converted haxe source compiled to flash platform (flash_ax3 version of the game) acts same way as original as3 code (classic flash version).
This particular bug (and some other fresh ones) happened only on flash_ax3 => their converter was not accurate in some aspects and needed to be fixed.