For issues you find with the Switch and Console releases, please follow this link and give as much detail as possible. This is the speediest way to get info to Pipeworks and get a hotfix in the works.
For issues you find with the Mobile 1.3 update, please follow this link and give as much detail as possible. This is the speediest way to get info to DR Studios to look at your issue. Also, some troubleshooting hints here.
What hardmode enemies are you trying to summon for your pre-hardmode invasion? I know there's lots of enemies that don't work outright during invasions, or else have issues. Enemies that crash should probably be patched, though.
Autoinvasions is a placeholder for something I wanted to eventually add. I'm too busy to add it right now, though (on account of my Adventure Mode, which is nearing beta). PRs welcome, though. Just saying.