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.
(1.3.6 Suggestion) Add the Pocket Mirror & Hand Warmer to the Ankh Charm
This is a pretty cool idea. Like others have said, the Pocket Mirror would super difficult to grind for. Especially if you just want to get the Ankh Shield. A possible and easy solution to this would be to make the Pocket Mirror have a 3%-5% (6%-10% Expert Mode) to make the grinding a bit less painful. This new version of the Shield would make exploring the Marble biome a lot easier.