Exactly. It is that characteristic of what people refer to as the "passive voice" that I - erroneously as it turns out - inferred to be its definition.
Thus, I latched on to a more abstract characteristic of the "passive voice" and substituted that characteristic for a definition.
In a sense, what I did was similar (or at least a cousin to) a mondegreen which is another thing I've learned about recently. A mondegreen (if you've not heard of it) is when one hears "there's a bathroom on the right" as the singer is singing "there's a bad moon on the rise."
I was not previously familiar with the word; so I looked it up.
According to the Merriam-Webster online dictionary, it means "a word or phrase that results from a mishearing of something said or sung <“very close veins” is a mondegreen for “varicose veins”>."
In other words, just about exactly what you said...