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.
maybe they would show up as an annoying mini-boss that tries to take your pets/summons from you haha (but you can secretly purrify them via making proper houses and animal treats and such for when they come to take a look [additionally pet/summon houses and treats would be a good idea to give boosts])