Villagers are immune to zombies

While attempting to recreate another bug I was going to report (I couldn’t recreate it), I noticed a husk walk into a village house at night. I didn’t pay much attention until I realized the husk never left. When I went to check it out, I noticed the villager calmly laying on the bed while the husk stood over him. The husk’s AI wasn’t broken, as when I accidentally punched the villager it chased it and killed it. However, the husk can attack the villager if it stands on top of the bed, but not if next to it (as shown with the recreation, where I placed planks where the roof would be making it impossible for a mob to enter the space, then broke the block and saw the villager get zombified.

To recreate the glitch I placed 2 blocks over a bed, with one space of air over the bed after the villager started sleeping. Then I spawned in a zombie. The zombie couldn’t reach the villager until I broke one of the blocks.