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.
There's a large version gap between Terraria PC and Terraria Xbox (1). Xbox would need to catch up for crossplay to happen, but their are 2 reasons that this might happen sooner than previously believed:
-For the 1.3/220.127.116.11 update, Xbox recieved a rewrite of the code to match that of pc, making ports much simpler and quicker
-I.4 is the scheduled last update for Terraria, other than bug patches. So when console gets 1.4, pc will also be at 1.4, meaning they are at the same update.