No message body with GrapheneOS webview

Downloading email, viewing title, sender and addresses works but the message body does not load for any email. “show remote images” and “download complete message” buttons do not load the body.

Reinstalled K9 twice. Cleared caches for K9 and webview.
Restoring vanadium system webview through graphene’s app store to the factory defaults results in K9 crashing when trying to render any email body rather than displaying a blank body.
Other apps seem to render with no issue.
I’m using fastmail as my email provider though I don’t think that would be relevant.

K9 version 6.603
Vanadium System WebView default settings version 119.0.6045.163.1
Android 13
Pixel 6 Pro