I think it could be related to the new certificate, like here:
Safari still doesn’t accept the certificate as valid for me. (I haven’t tried manually installing the certificate like @FrodeW yet).
I can’t get markdown clipping to work no matter how many times I try. It usually works on the second try when the first one fails, but now I just get markdown document containing only a metadata header with title and description.
I have been experimenting with clipping articles as markdown in other ways, so I hadn’t noticed how consistent the behaviour is and connected the dots before today.