ParlorPink I don't think it'll throw any errors, it's just behaving unexpected (Flarum logs are found at <flarum>/storage/logs, since you ask). Maybe it's related with KaTeX cdn? Or is it a cache related thing (php flarum cache:clear)? I'm not sure.
1Dot we have "decisive keywords" for that. Use [imath=ignore][/imath] or one of your custom decisive keyword that you set in extension settings. Or simply set code as ignored tag to skip rendering equations in code tag. Having said that, I wonder if you experiencing the same issues as @ParlorPink ?
0.3.6
- Fix wrong KaTeX css version.