Transparent PNG displays incorrectly in the Background layer of VFB

[hill_lam]

I tried a lot of transparent pngs and most of them have this problem.
This png has been uploaded to the attachment.

By the way transparent .tif works fine. I saved this png as tif and the problem was solved. But no matter how I save the png (change the icc profile, compression rate, etc.), it cannot be displayed correctly.

[hermit.crab]

Refer to this thread for an answer.