Copies of folder names with dots have the "(copy ...)" suffix inserted in the middle of their name

It seems when creating a duplicate of a folder, its name is treated like a file name with an extension. If you copy a folder with a . in its name and paste it in the same location, the (copy ...) suffix is inserted in the middle of its name.

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Steps to reproduce:

1. Create a folder called a.b.
2. Select the folder, press ctrl+c, then ctrl+v.

Expected result: A new folder called a.b (copy 1) is created.

Actual result: A new folder called a (copy 1).b is created.