WPF Rounded window corners with semitransparent blurred background still blur even with window transparent

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I want rounded window corners (more specifically, only on the top two),
however my window background is semitransparent blurred of whatever is behind it, and I'm trying to use the usual method of having a round corner border, which works, but the window, even though transparent, still gives off a blur effect.

Here's what's happening (showing one corner) enter image description here

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