Do Shulkers despawn in Minecraft 1.12?

Do Shulkers despawn if I get far away enough from them? I'm not asking if they despawn in peaceful mode because they don't. I'm asking if they despawn when I'm far enough away. I didn't find anything online so I thought I would give this question a try here.

Shulkers don't despawn and don't respawn. They are generated alongside with The End City structures as they are generated as the city spawns, and remain there until killed. They may teleport around in certain conditions, but they remain "persistent" wherever they teleport to; if you move away and unload the chunks they were in, then return loading the chunk again, they are still there.