How to fix the curved display png in the admin panel of modx revo?

Hello, tell me how can I fix this to display preview images

6b5610bb6ea243818408f3c700ecbc8e.png

On pictures of the background image should be transparent.

Then there's normal, there are generally a solid color, it happens if images have a transparent background.
July 12th 19 at 17:30

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