I upgraded to version 5.3.186 and now have a bug. When loading a sprite sheet into a sprite object via the “edit with piskel” object the image imported is messed up in Gdev. the sprite sheet if verified and clean, but when imported via piskel into Gdev  the opacity on edges is removed and the sprite is turned into a solid color; and  the animation is removed / not played at all [even after check marking “loop”]. this happened with the new 5.1.186 version.
Piskel doesn’t handle alpha, it makes pixels are either opaque or transparent. If you want to keep the image alpha, you need to edit the image with a external tool.