Stencil render doesn't match with objects.

Development Rendering
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1

Hello, can anyone help me with the stencil problem?
I’ve set up the materials using for Widget that will only be rendered by stencil render object but there a problem as you can see in the video that red square button that applies with Materials I created doesn’t match with the box can anyone help me or explain why.
Sorry about my poor English.

2

"This is happening due to how scaling in PIE is different for the widget. If you play in standalone or even when you fullscreen your viewport ( you do this by pressing F11) this works as expected "

I got this answer from Epic developer directly