Win10 - Bitlocker USB flash drive always opens twice, why and what to do about it?

I have a (on Win7 Ultimate created) Bitlocker-encrypted USB stick. Each time I plug it into my Win10 Home notebook or desktop at work, the explorer window with the root directory of that stick opens twice. For normal USB sticks, this only happens once, according to the settings under "Settings-Devices-AutoPlay".

Why is that?
How can I change this?

First, the browser opens the normal file content, which is located on the stick, then detects the Bitlocker service and this then automatically opens the "unlocked" overview in a new browser window.

Look for "automatic unlock disable bitlocker". That could already have been the solution.