Stencil render doesn't match with objects.

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.

"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