How can I use alpha in an image with sprite animation?

The last few frames of the top animation do not fade, they just stay there and then it ends.

It seems sprites just have cutout transparency? How can I use the alpha from the image?

The blend mode should be combine by default, can you share a repro ?

This turned out to be some state change by SpriteMap. I moved SpriteMap to another scene and it works.

This was the cause.