That markdown doesn’t work well for community links. Sadly the Voyager app does wrap community links in markdown too, which deactivates the cross-instance-linking that was supposed to be achieved with this link format.

Writing them in plain text, without markdown, works best in my experience:

• !Balatro@indie-ver.se
• !Silksong@indie-ver.se
• !Cuphead@indie-ver.se
• !Indieverse@indie-ver.se (meta)