Request with font weight not working

[jploch]

This is not working for me (works with Google Fonts): https://api.fonts.coollabs.io/css2?family=Aguafina+Script:400&display=swap

While this is working: https://api.fonts.coollabs.io/css2?family=Aguafina+Script&display=swap

Is this a bug or is there anything else to consider, when loading font weights?