Mail is unreadable after installing Tahoe.

Hello,

After installing Tahoe, emails display unreadable text in the form of Helvetica Fractions instead of a standard readable font. This mainly occurs with regular emails, but not with marketing or HTML emails—though those are occasionally affected as well.

Additionally, when composing a new email, the editor automatically switches to Helvetica Fractions, and it is not possible to change the font or switch to another Helvetica typeface.

Could you advise on how to resolve this issue?

Thank you,

L.W