It's not a PlayStore problem, it's a buggy libskia library (probably something else affected, too).
It's a 2D graphics library that deals with png transparency, filters, antialiasing, etc.
It seems all 4.2.x mediatek roms come from a common source. Maybe if we can find a MTK 4.2.x rom without this problem, we can replace the affected libraries.
I may try to recompile it from source for API 17, but can't guarantee it.
Not sure if it possible to compile it for MTK devices without the full source code.