Known issue : Lightning custom app not entirely copied to sandboxes
 
Sandboxes upon refresh are not showing up Lightening Apps in the app picker. I appreciate if anyone can kindly let me know the workaround if any !
 
The Deployment workaround provided in the link isn't working though. I deployed those missing lightening apps to several refreshed sandboxes and are still missing.
Link :
https://success.salesforce.com/issues_view?id=a1p3A000000eiuvQAA

Hi there!

From one day to another, my Home tab has dissapear from all the apps for all the profiles (including System Admin). Does anybody has any idea of what could be happening and how to solve it?

Thanks a lot in advance!