Problem with alpha chanel, its diapears in aunched game

Hello, UE community.
I get a bug, that i cant figure out for a certain time.

What i wanted:


i use scene capture component 2d, that making real time portrait for my game
works perfect in standalone mode:

BUT! when i launch game for explorer with RMB (like this):


my alpha in render target disaperaring (what i set for examination):

and what i get in launched game:

plz halp)))