Co-op Mode Warning
Hoyoverse hasn't put out an official announcement yet, but this is a serious issue, so I'm taking some liberties here. Do not let anyone you don't know into your world for now! There is a recently discovered exploit that allows hackers to use Kaveh and a third party app to permanently remove content from your world. So far, it's only been recorded in Chinese servers, but until we have confirmation that it's fixed, I recommend rejecting random co-op requests to be safe. Video evidence here.
The removal is on the server side, so logging out or uninstalling the game will not restore lost content. Hackers can also use this to delete the Traveler, which locks you out of your account entirely.
For clarification:
Update: Some sources also say Nahida can be used for this, but take that with a grain of salt.


























