Duotone fa-swap-opacity doesn't work with some icons (mostly files)

[mira-matze]

Affected icons:

• fa-copyright
• fa-file-download
• fa-file-edit
• fa-file-excel
• fa-file-exclamation
• fa-file-medical
• fa-file-minus
• fa-file-pdf
• fa-file-plus
• fa-play-circle

[tagliala]

Hi!

Thanks for being part of the Font Awesome Community and thanks for reporting this.

Reproducible test case: https://jsfiddle.net/tagliala/o1qtda9h/9/

I think I've got what is going on: some background layers are not cut out

I can also add some more:

• fa-copyright
• fa-file-download
• fa-file-medical
• fa-play-circle

Let's assign @sensibleworld