Hi, I'm also having this screen tearing issue (I'm using Godot v4.5.1 & the renderer is set to Compatibility). Otherwise I love the tool! Have you been able to track down what might be causing it, or any alternative solutions? Thanks!
Oh also, in case it's helpful to you for the future - changing the scene size seems to reduce the severity of the scan lines compared to leaving it at the default template size (both 540p & 1080p helped reduce scan lines).