Why not duplicated nodes?

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1
:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By Tort
:warning: Old Version Published before Godot 3 was released. 
print(get_node('Navigation').get_child_count())
get_node('Navigation/navmesh').duplicate(false)
print(get_node('Navigation').get_child_count())

Output

1
1
4
:bust_in_silhouette: Reply From: ugly_cat

You need to instance it and then add it as a child of a different node.