This sounds very simple -but is perplexing.
When logging in after a simple reboot of HA, I noted a two of my automations were reporting as broken. I discovered that my smart plug was no longer recognised in HA in any capacity. Later, I realised that my TuYa lights had also vanished from HA, but as they have no automations/scenes/etc. connected to them, no errors were reported.
After another reboot, I was met with a TuYa integration error saying I needed to reauthorise. And so I did using the app, hoping it may have brought up the missing items. None came back.
However, all devices work within the TuYa app without issue. I figured perhaps calling on a back-up would sort this out. Nope. I tried one a few days old then another over a week old - the automations are still reporting as broken, and the devices are not found in any areas (eg developer tools/states) that I am used to hunting in.
I had figured perhaps the devices were broken but they all work flawlessly from their own app - so it seems this is a HA problem or a TuYa integration issue.
As ever, any advice/suggestions are appreciated 