ViewportFrame BorderMode property has no effect

The BorderMode property of ViewportFrames always appears to be outset, even if it is set to middle or inset. This bug only seems to happen with viewportframes exclusively. I first noticed this bug several days ago. To reproduce, simply place a ViewportFrame within a screengui or any other gui object and set the BorderMode to middle or inset. Also recommended to increase border thickness so the issue is more obvious.

This is correct:
This is not:

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Hi @Protectorates - thanks for reporting this issue and for providing screenshots demonstrating the issue! I’ve created a ticket for us to investigate and resolve this.