ibbxys ibbxys ah, yes, that's a distinct problem from the last one. Last one was specifically about the discussion title, I don't think the forum title was reported or investigated at all at the time. I can confirm the forum title bug happens on my 1.3.0 test server.
Could you create a GitHub issue for it?
I wonder if it's not another side effect of the fix for the original issue described in this discussion. The forum name is inserted into the translator already properly formatted (without HTML entities) so it must be the translator doing something weird.
I can't find any more useful information from looking at the source code. For reference that's where forumName is passed to the translator https://github.com/flarum/framework/blob/4748f31d93d7159da424b5abb0ee2a520f91d48d/framework/core/js/src/common/Application.tsx#L403
