The issue concerns the Discourse-mermaid-theme-component not working after installation. fryorcraken reports the problem, noting that the official example preview also fails in Firefox and Brave, suggesting it’s not a local issue. JammyDodger attempts to reproduce the issue using a Mermaid diagram, while Lilly confirms the problem was resolved in a later version and advises updating Discourse.
The Mermaid theme component does not seem to work once installed on my instance.
Do note that when checking the official post: Discourse Mermaid
It points to this preview: Discourse Mermaid example - general - Theme Creator
The preview does not work for me on Firefox and Brave so it seems the issue is not specific to my install.
Hello and welcome @fryorcraken 
Let’s see if it we can repro here:
graph TD;
A --> B;
Can you see the example above?
Hi @fryorcraken 
I could reproduce your issue on an earlier commit version but it should be working now - can you update your Discourse please?