I think I see the problem now. Alexa/Wyze Skill refuse to execute two routines in close proximity.
I have a front door cam and a driveway cam. Frequently but not always a given human will cross both of their (narrow) detection zones.
When I had Wyze announcements toggled under Alexa, Devices, Cameras, this worked seamlessly. A person crossing the zones would trigger two announcements, which would get spoken with 1-2 seconds of each other.
But now that my detection for these depends on two Alexa routines instead, I am getting announcements on front or driveway, but NOT both – even though the Wyze Events page shows accurate person events on both.
I guess there is a limiter on routines processing detection via the Wyze skill. This is NOT good.
I will probably switch things back the way I had them.
Edit: Just to mess with me, both triggered properly just now. (No changes)