[Donkichot]

Well there was the "Microsoft Blue Screen of death" now meet
The "Apple HomeKit white screen of death"...
HomeKit app show a white screen with this message
"Loading Accessories and Scenes"
That never end loading...
The only way out is to reset HomeKit app and start over from scratch...
Rescanning all you HomeKit devices
And remake all your automations, scenes and rules...

[Donkichot]

Some forum claimed that login out and login back in iCloud did solved that bugs...
Doing this with all your Apple device iPhone + iPad +ATV etc...
Sadly I found that to late...

But some people said that didn’t work for them...