Who is online incorrectly reports page when posting with only post URL parameter

Since phpBB version 3.3.11 the Who is online incorrectly reports the Forum location of an user when he is editing message instead of creating new topic. Instead of 

it reports 

Who is online also incorrectly reports the Forum location of an user when he is writing a private message. Instead of 

it reports 

While writing a private message instead of browsing, it reports.