Thank you for confirming that Child Actor Component is buggy, I was afraid that I’m only one who see it like that 
That’s interesting approach, but I’m afraid won’t suit for me, since I want to have that animation for my Actor’s (i.e. BP_Chest) static meshes (i.e. SM_Drawer). Otherwise, it will be very hard to maintain, I think.
At this moment I’m sticking to use Timelines with Play from Start/Reverse from End entries, so interactions will be waiting for animation to finish.
If no better solution will be presented, I’ll publish my BP image with how I implemented it for future developers. Actually I will do it as soon as I reach my PC xD