Minecraft stays in background and don't start if Junction Point is used for C:\Users

Nativelog.txt:

Set run directory to ...\Minecraft
 Native Launcher Version: 1665
 Operating System: Windows 10 Enterprise
 Application Hash: c9b11bc96b23ea3e08c45e9e04fa9d3d6ae47fe7
 Application Data directory: C:\...\AppData\Roaming/.minecraft
 Executable Path: MinecraftLauncher.exe
 App Directory dir: ...\Minecraft
 Start dir: C:/.../AppData/Roaming/.minecraft
 Launcher dir: .../Minecraft/game
 TmpDir dir: .../Minecraft/tmp
 (Optional) Java Launcher hash: 
 Java Version: 1.8.0_51
 x64: 1
 LauncherConfiguration from: [http://launchermeta.mojang.com/mc/launcher.json]
 Downloaded config
 Native launcher is current
 Native launcher is current
 C:/.../AppData/Roaming/.minecraft/launcher_profiles.json doesn't exist, new user?
 Using new launcher as a launcher.dll is on disk.
 Launcher library is up to date with hash 6c87deea578c0d3d9206c0cd0f611c0ff45e7cec
 Check to see if we can run the launcher
 Native launcher is current
 Starting launcher.dll with ...\Minecraft\runtime\jre-x64\1.8.0_51\bin\javaw.exe
 Found SetDllDirectoryW in kernel32.dll!
 Added ...\Minecraft\game to DLL search path
 Running launcher!

Also found this blog, it's the same to me with the Junction Point: MCL-5569

I just did test it out myself on a Virtual Machine.
An installation on a normal setup windows 10 works fine and the launcher starts normally.

If there is a Junction Point in use for the users folder the Launcher is unable to start in foreground and stays as a zombie process in background.
Funily it still creates the .minecraft folder in %appdata% and uses resources off from my system.

Hope you can fix it. I wanna play Minecraft without being forced to push my Userfolder back to drive C: just for one game.