There seems to me a problem with the current encoding of the forum logo on the discobot certificates.
As I have been having trouble with the discobot certificates, I had a glance at the svg that is being generated.
This jumped out:
...
<text x="269.2915" y="240.94" text-anchor="middle" font-size="24" fill="#020403" font-family="Tangerine, Tangerine">
Mentalstring
</text>
<g transform="translate(242.29149999999998 350)">
<image height="55px" width="55px" xlink:href="data:image/png;base64,[LONG BLOB IN HERE]="/>
</g>
</g>
<g id="Layer_1-2" data-name="Layer 1">
..
That seemed encoded when it shouldn’t, so I converted the entities, and got the Discourse logo which was missing:
Here’s the current certificate:
And here’s the same svg but with (manually) fixed encoding: