hello again..
maybe its not a bug ^^
my english is not so good, that i can explain, how exactly this works, but i think and hope this tutorial will be a little bit helpful to you and others..
source: George Donnelly on youtube
www.youtube.com/watch?v=zGFHpCPJOek
i think he explains at circa 19m:40s your problem with the hidden posts..
wish u all the best
Thank you fr the tip!