So I restarted my OG HomePods which forced my HomePod Minis to be the hub and now the Wemo is working fine and shows as a thread router in the Eve app. I bet the next time the OG HomePods take over it will glitch out again.
Well here we go again, but this time I know what to look for. Communication between my Wemo Mini smart plug and HomeKit is glitching again. At first it showed that the outlet was turned on even though it isn't. But now I'm getting the dreaded "no response."
Checking the Eve app I can still the outlet listed under Thread devices but it's not showing as a router anymore. That part is just blank.
I checked my Home hubs and it turns out one of my damn OG HomePods took over as a hub.
So, I restarted the OG HomePods which then forced one of my HomePod Minis to take over as the hub. And golly Bob the plug started working again immediately and is showing as a Thread router again in the Eve app.
Conclusion: Apple FFS will you please let us decide which devices can be hubs since some clearly work better than others!