Purpose of Unknown Node as part of core nodes in standard installation

Can someone explain to me what the purpose of those unknow nodes in the core nodes is?

It seems that it is really part of the core nodes.

if you look into the code - it looks like an empty template - but nothing useful.

it looks like an empty template - but nothing useful.

This is the node that shows up when you import a flow that uses nodes that you do not have installed. So it is a "core" node.

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Ah ok, thanks.