Resolution: Not a bug
As a site-admin, when using the Suggest changes feature, it will fail with a "Something went wrong message if the user has never logged in to the site.
- As a site-admin, invite a user to the site.
- Make sure that the user will not log-in or accept the invite.
- Go to the site's administration (I.E. https://examplesite.atlassian.net/admin) and tap the user's profile.
- On the right side, tap the Suggest changes button and fill it with a name/email address.
An email should be sent to the user.
A "Something went wrong" message is triggered on the bottom left:
Have the user accepting the invite/accessing the site prior to suggesting the change.