As for the version, my instance reports it as

0.18.1-2-ga6cc12afe

So it seems to be using some extra patches, but I can't find that commit on GitHub which indicates it might not be public, or cherry-picked locally.

So with this in mind, either it's just innocent performance patches, or someone potentially also introduced the markdown vulnerability.

Although it's also entirely possible I suck and wasn't able to reproduce it correctly/had wrong quoting or something. Hopefully the devs can shine some light in the details.