Since posting the original issue I have witnessed high battery consumption a couple more times. I am unsure of the correlation, but the reported high consumption seems to be recorded along with some other OS symptoms - namely the phone becomes very slow, especially when using the power button to wake the phone from standby, and the screen stays very dim. A soft reset fixes the issue, but when I check battery saver MSPU app will be shown as very high usage.
I can go days at a time without a recurrence, and during normal operation I see expected battery usage details from the MSPU app. I have not identified anything that might be a trigger to the condition. There are others on the WC forums reporting similar responsiveness/screen dimming issues but not correlated to any app other then my own added comments.
I cannot say if it is the app going crazy that effects the OS issues I described or the other way around.
FWIW - I do not use any of the podcast or video features typically, just article reading.