The Hitbox on a Zombie Villager isn't the same as a regular Villager! One of my Villagers got converted and then suffocated in a block after it's hitbox was raised ever so slightly due to becoming a Zombie Villager. (I have a snow layer base) I'm no Zombie expert; but I'm pretty sure being infected doesn't help you grow!
If the hit box was shrinked to be the /same/ height as a regular Villager (Like it should) this irregularity would be eradicated as well as that we'd have a sure-fire way of organising Zombie Villagers from regular Zombies! So there is a positive to it to! I'm sure its not too hard to fix! Sure, it's a bit petty. But, i think it's worth adjusting to avoid losing villagers to suffocation!
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Dupe of MC-54615
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As you can see, the zombie villager is upper then the villager (don't know if I wrote that right)
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I just had this same thing happen too! and to Bardh Shala this is a pic without the snow - http://gyazo.com/c349eaa196ede564d4d636b2edeaea51 It is kinda weird. It'd be cool if they did shrink the Zombie Villagers. You'd be able to sort them! ;D I doubt they'll tweak the hitboxes though, it's kinda petty. Sure, it'd add a mechanic (which would be great) but I doubt mojang would waste their time on these small time inconsistencies. I hope they do but I highly doubt it. Hitboxes don't sound like a priority xP