Japanese font without Japanese character causes the clip at the bottom. A refactored quick workaround.

JapaneseFontProblem.swift

import SwiftUI

struct SmapleView: View {

    let ctFont = CTFontCreateWithName("HiraginoSans-W3" as CFString, 50, nil)
    var ctFontDescender: CGFloat {
        CTFontGetDescent(ctFont)
    }
    let borderColor = Color(.systemBlue)

    var body: some View {
        HStack(spacing: 10) {
            Text("Copy")
                .font(.init(ctFont))
                .border(borderColor)
            
            Text("Copy")
                .font(.init(ctFont))
                .baselineOffset(ctFontDescender)
                .border(borderColor)
        }
    }
}

struct SmapleView_Previews: PreviewProvider {
    static var previews: some View {
        SmapleView()
    }
}

• Japanese font causes clipping.
  https://gist.github.com/Koze/6a987981ae2d68a1d71d9d21cf77b0e6
• Setting Text frame doesn't work.
  https://gist.github.com/Koze/17050bcdab3e578aff993f193e27a45a
• Using baselineOffset works.
  https://gist.github.com/Koze/e32b833b2150313f4637414b2b76da0d
• Using CTFont instead with Font and UIFont.
  https://gist.github.com/Koze/52e7cce4dac069592fbcfdeca4d2ec97 ←
• Using offset (or padding) for adjustment.
  https://gist.github.com/Koze/376b0ff231107569f073f026eac2e688
• Refactor as extension.
  https://gist.github.com/Koze/bd1285ab6471528e3e22cd8de3d64804