In the past, ghosts would dig into the ground after a while and then dig themselves out. Now after digging into the ground, they pop up briefly with no animation and die automatically (sometimes after a brief pause).
This .gif is from compound, but I’ve noticed it on every map I’ve played recently. Sorry for the late report, but it’s important to note that I remember this going back as far as Hotfix 0.9.1.2. Might have something to do with:
Zombie Massacre: Fixed zombies getting stuck in Nightyard and in general. AI that cannot path correctly or is stuck will be automatically removed