Some icons are rendered incorrectly in macOS CoreText font engine.

[StingKo]

For example, in the following code, setting the wght variable axis of a “Library Add” icon to 900 causes the size of the internal plus sign to be disproportionate to the external elements.

let attributes: [NSFontDescriptor.AttributeName: Any] = [
            .name: "Material Symbols Outlined",
            .variation:[
                    2003265652: 900 // wght
            ],
]
let descriptor = NSFontDescriptor(fontAttributes: attributes)
let label = NSTextField(labelWithString: "\u{e02e}")
label.font = NSFont(descriptor: descriptor, size: 26)

This is rendered by CoreText：

This is from the Google Fonts website：

After testing, most multi-layered icons exhibit similar issues.