Josh is correct that the post jumper was broken in a couple versions. Like I said, if you want it to work that way you'll need to check over at threadsdev. I know you've been running .threads for a very long time but I've been coding .threads for a very long time and trust me, the current behaviour is the way it's designed to work

You can look in the bugs forum and see the complaints for the couple of versions 6.4.x where it wasn't working properly.