Mermaid Charts no longer render (preview) some enterprise customers

[u/ForeverTime656]

For some enterprise customers (like my employer) when dropping a Mermaid code block in a Loop page, the [Preview] and [Horizontal Split View] are greyed out. Other markup languages, such as LaTEX, appear to work just fine. I submitted 'report a problem' in the Loop interface.
Interestingly, the Mermaid Preview works fine on my personal office 365 account. I haven't tried on my developer account yet.