Animations in SWF are glitchy

[mikhailitsky]

I'm attaching both a FLA and an accompanying SWF files (link) with a broken animation that used to be played correctly in OpenFL 8.9.6 but is not in OpenFL 9.0.2. There is a movieclip in the FLA file, which is exported to ActionScript as assets.Animation. In order to reproduce the bug, just import the movieclip and execute the following code:

addChild (new assets.Animation ());

Closer to the end of this animation, the animation pieces lump together in the upper left corner of the movieclip, which is wrong.