Remove border around images exported to Facebook Store

Hello!
On my website I start to used portrait 3x4 images for products, but find one problem: when product exported to Facebook commerce manager, it becomes square with white borders.
When I manually added products to FB in same size and ratio, facebook fill it to square, and all is ok, so it is problem on Shopify side.
Is it possible to change it?

Website: shirokai.com

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I’m having the same problem - would anyone be able to help?

Is there a way to change the white border to another colour at least?

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