Windows: Symlink not always created as a folder

[M-Zuber]

I was unable to come up with a clear set of reproduction instructions, but every now and again npm i only creates a file for the symlink

I can cd into it, but can not access it through the regular windows explorer.
npm i was run inside the WSL with the following node.npm versions

node: 7.10.1
npm: 4.2.0

Although I have seen this issue when running inside a regular windows shell where I have

node: 8.4.0
npm: 5.3.0