Thanks for the tip! Unfortunately in Jerboa it seems like this form of link just crashes the app lol.

Edit: this might be because these communities aren't on my instance.

Edit 2: these links seem to send me to [instance]/comment/c/[community], e.g, https://discuss.tchncs.de/comment/c/cats@sh.itjust.works, which doeesn't work because the "/comment" part shouldn't be there. Not sure what's up with that.