*Steps to reproduce:*
# Open  a prefab in context mode using >
# Select a child object of the prefab and right click -> select prefab -> replace with a different prefab
# Undo

*Actual results:* The prefab used for replacement doesn't get removed properly

*Expected results:* The new prefab should be removed and the previous child node displays

*Reproducible with versions:* latest main

*Tested on (OS):* mac