I'm running Brave 1.92.134 and found a very simple way to reactivate AutoControl even though it has been disabled as a Manifest V2 extension.
I can't remember whether the disabled attribute was on the <leo-toggle> element itself or on one of its child elements, as it disappeared after I enabled the extension.
After re-enabling it, I restarted both Brave and my PC. The extension remained enabled and continues to work normally.
This is now the second time I've had to work around Manifest V2 restrictions, first Chrome, and now Brave.
Because of this, I'm starting to migrate my automations to Tampermonkey.I'd rather not rely on browser-specific loopholes that could disappear with the next browser update if Manifest V2 enforcement becomes even stricter.
Hopefully this information helps identify what's preventing the extension from being enabled, as it appears the extension itself still functions correctly once the UI restriction is removed.