Hunch apparently correct. 
This morning I ran the same test as above (post #19) but substituted a CamPlus trial for Legacy Person Detection.
11 of 11 triggers succeeded
5 days later:
12 of 12 triggers succeeded
Some White Bulb v1 owners speculate that Wyze chooses not to fix the erratic Rules/Scheduling behavior of that product. Quickest fix: Upgrade to White Bulb v2 or Color Bulb.
Are Legacy Person Detection (LPD) customers being led to a similar conclusion with respect to CamPlus?
Will LPD soon be retired with subscribers offered free months of CamPlus to soften the blow?
‘Treating customers like friends’ requires a company to speak to them like adults when a change is afoot. Manipulating customers into behavior beneficial to the company by allowing them to pursue futile troubleshooting is downright ‘unfriendly.’ 
That said, you’ve got to give Wyze credit for offering LPD gratis (name your price) to compensate those who were promised free on-camera person detection through a software partnership that ultimately failed. That was stand-up, very unusual and quite friendly. 