Cutout

When this feature is enabled, pixels that have an alpha value below that of the threshold parameter will not be drawn and instead will be discarded.

This is useful if your preset is solid and isn't transparent. In which case you can utilize the Solid Cutout Rendering partial preset in ValueFactory/Rendering which will utilize cutout, enable z-write and drop the render queue down below 3000 which may help solve issues you're having.