fontawsome icon work in preview but is not shown when generating an image.

[alanlivio]

For instance, this basic example from the mermaid documentation is not shown when generating an image.

flowchart TD
    B["fa:fa-twitter for peace"]
    B-->C[fa:fa-ban forbidden]
    B-->D(fa:fa-spinner)
    B-->E(A fa:fa-camera-retro perhaps?)