With the Update came during the week. Not on the weekend. On 8/26/2020 I installed version 20.154.0802.0003. An insider version. And I was curious. Because with the installation also a ghost or duplicate, which had been there for some time, disappeared. Microsoft told me that you did not know where this duplicate came from. But that it would be gone with version 20.154.xxxx.xxxx. What am I talking about?

I have two identical entries, but only one common memory location. But in the meantime, I found out what causes such a behaviour. For a Remote OneDrive Workshop I rolled out a group policy on this machine.

It is the group policy Configure team site libraries to sync automatically

This Group Policy automatically adds a selected library on the device.

Come-back later, (This group policy takes some time to run) open the Windows Explorer, the selected SharePoint Online Library was entered, the content synchronized, but also the second icon was there.

Microsoft was informed about the behaviour. If someone notices the same behaviour, then notice this blog post, I will post the update here.

[Update 09/09/2020]

all-clear

Today I received the new Insiders version 20.169.0823.0003. And as if by magic the shadow entry is gone.