Hello Maxzippoman,
Thanks for reaching out to the Apple Support Communities! I understand that the automations that you have created in the Home app are not appearing, and not working when recreated. This issue only began after updating the iOS and tvOS. I have several automations set up in the Home app, I understand how important it is to have them accessible and working. You've done a great job troubleshooting the issue up to this point. There are a few more settings to double check.
First, please be sure that your iOS device and Apple TV are both signed into iCloud with the same Apple ID, and you have turned on iCloud Keychain as well as Home in the iCloud Settings. You can check the settings on your iOS device by going to settings > [your name] > iCloud.
Next, check to see that you have Bluetooth turned on your iOS device. Also, verify that you can access the internet over Wi-Fi by going to Safari and trying to access the Apple homepage.
Once that is verified, please restart your iOS device and your Apple TV following the steps below:
Restart your iPhone
Restart your iPad
Restart your iPod touch
How to restart your Apple TV
After both have been restarted, follow the steps under, "Check the status of your home hub," to verify the correct device is connected: Set up your HomePod, Apple TV, or iPad as a home hub. Once you have the primary set up, check the automations again, and see if there is any change. If there is not, please message back with more details about what is occurring. If you're receiving any alerts or messages, be sure to provide us with the verbiage.
All the best.