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 1.3 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.
I just got an idea for dyes that could be used in 1.4. I wanted to suggest this now seeing as how 1.4 is gonna be the last update. I was researching dyes on the Terraria wiki, when I realized there was no way to make specific dyes. Stuff like mixing certain dyes and having different patterns...