What is up with the reply Post Incubator?

[GoneToAle]

Why does the entire thread disappear into an incubator after a reply is posted? Then after some amount of time it reappears in the “New posts” lineup.
I have not noticed this on other forums. Perhaps it happens in those too and I just haven’t noticed.

 

[GoneToAle]

Sorry, I’m an idiot. I figured it out.