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.
1.4 will bring many changes to the PC version. We strongly advise making plans to back up your worlds and players prior to updating your game. More details here.
Begin your search for Journey's End information here and here. Please report bugs and issues for Journey's End here.
For issues you find with the Mobile 1.4 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.
I see that a number of people are annoyed by the npc happiness system. Me? Well, It incentivated me to build different houses for 3~5 npcs, and since I'm playing the game with the minimap turned off, nothing stops me from making a village at the spawn. So It didn't really hindered me.
Actually, the entire mod source is disponible on GitHub, you just need to look in the right place to find the sprites. For example, the companion sprites are in Creatures folder, each folder is to a different companion (Terrarian companions will not have a sprites, obviously). Items... Well, on...