I think yesterday, or Tuesday I got a stray notification about about 13.6 being ready... I'm 100% on public, no betas or profiles installed. Haven't done the betas in last couple of cycles.
Clicked on it, phone unlocked then vanished, nothing in settings, was very weird. Maybe they found something last minute.
same here over the weekend...thought I was crazy. (Well I am, just not for that reason...)