Villagers glitching through glass - reproducable

When building and iron farm, my friend and I had villagers in a holding cell (1x1x2 enclosure) made of glass on my server. When i turned my server off, and then turned it on later and went on, just over half of the 34-36 at the time glitched through the glass. I have a screenshot of where i think they glitched through. I hope this bug is resolved, because it is not the first time this has happened. But even with the bugs, this game is AWESOME, and i really enjoy playing it, so thank you!