Problem: Lock Hierarchy doesn't work when enter prefab

I think the title say it all, but i explain below:

I'm using 2018.3.0f2 and i set two Hierarchy tabs, which one i lock in scene and the other i leave it unlocked.
When i enter the prefab to edit it, the locked Hierarchy doesn't keep in scene.

So the lock feature in the window tab is not working for the new prefab feature.
I really want to keep one hierarchy locked in scene in case i need to assign any object/prefab in scene to the prefab editting. the unlocked hierarchy is ok to show the prefab editting, but the locked shouldn't