fill-paragraph fills planning line; blank line possibility

[Samuel Wales]

recent maint -- but i have not got an mwe.  i could be doing something wrong.

* x
SCHEDULED: <2020-03-15 Sun>
mada wakaranai to omou kedo, ima no meeru wa sono koto asdfa muri ni
suru kanosei ga aru.

if i fill that using m-x fill-paragraph, it fills the planning line also.

perhaps somebody might know what i am doing wrong or if this is a bug.

also does anybody habitually put a blank line after the planning line?
 are there tools to support that?  does that even make sense?

-- 
The Kafka Pandemic

What is misopathy?
https://thekafkapandemic.blogspot.com/2013/10/why-some-diseases-are-wronged.html