Zombie Villagers making noises they shouldn’t be

I was playing minecraft just a few minutes ago on survival mode and there was a zombie villager nearby, so I slept in my bed to skip to morning. I went to go check on it and watch it burn, it was burning, but it was making the noises a skeleton makes when it walks or when it’s just standing around, and the noise it was making when it took damage was the noise a player makes when the player takes damage. The zombie villager was not making any zombie villager noises whatsoever