Menwhile there is a v12.12.0-rc.2 vor SHS available on Athom’s Github:
Which I was able to update to by Portainer:
Using the latest-tag still doesn’t work, you have to tag the exact version like above.
It also isn’t mentioned on Athom’s SHS changelog here:
SHS itself does show if there’s an update via Settings - Updates.
And also shows the correct version tag to use there. It also shows the changelog (but unfortunately I didn’t make a screenshot of it) and considers if you enabled experimental updates on Homey Developer Tools
I have also asked @Emile and @Doekse more than once, but they don’t answer… 
