Weird value for contentBounds.yMax during sprite animation

[SatheeshJM]

I have a sprite with multiple frames..
Whenever there is a frame change in the sprite, the value of sprite.contentBounds.yMax changes to a weird value during that frame.
In the next frame, it reverts back to the actual value

How to reproduce:

sprite_bounds_bug.zip
(have attached a plug-and-play project )

1. Run project
2. Monitor console logs.. When there is no frame change, yMax is ~630
3. When there is a frame change, yMax changes to ~570 for a frame and in the next frame it reverts back to the old value.
   (see below for sample output)

23:05:22.260  frame : 1;yMax : 633.5	1
23:05:22.276  frame : 1;yMax : 633.5	1
23:05:22.323  frame : 1;yMax : 633.5	1
23:05:22.364  -------------------------------------------------------------
23:05:22.364  frame : 2;yMax : 570.5	1
23:05:22.364  When changing from 1 to 2, yMax changes to a weird value temporarily
23:05:22.364  -------------------------------------------------------------
23:05:22.395  frame : 2;yMax : 632.5	1
23:05:22.426  frame : 2;yMax : 632.5	1
23:05:22.458  frame : 2;yMax : 632.5	1
23:05:22.489  frame : 2;yMax : 632.5	1
23:05:22.520  frame : 2;yMax : 632.5	1
23:05:22.551  frame : 2;yMax : 632.5	1
23:05:22.583  frame : 2;yMax : 632.5	1
23:05:22.614  frame : 2;yMax : 632.5	1

Any idea what is happening here?