Currently, it seems Avalon does not understand links like !community@instan.ce is a link to a community, but treats it as an email address. Clicking on it starts an email draft to community@instan.ce.
Expected result when clicking would rather be to view the community. I guess the app is blind to the !?
I've seen a few cases where links break, but haven't been able to find out exactly which cases are problematic. If you find any examples, please let me know!
User links are not supported as of now, but I'm looking at adding that soon.