Hi, not the same user but I'm having the exact same issue as them. Updated twice today from .04.19 to 05.12 and from 05.12 to 05.16. On the second update it intially failed to install. I went to the Installed Plugins tab and clicked update for community applications and it ran through it's updated okay. However the app list went away. I haven't rebooted to resolve this yet so I've attached my Diagnotistics ZIP. I hope it's of some help.
tower-diagnostics-20200516-2138.zip