AppleApplicationSupport64.msi 12.5.5.5 kills explorer.exe during install

When installing iTunes 12.5.5.5 as an application in Microsoft Configuration Manager (SCCM) with SYSTEM-account, AppleApplicationSupport64.msi kills the process "Explorer.exe" without restarting it again, so the end-user has no windows GUI (start-menu disappears). If the installation is performed using a "traditional" user-account instead of SYSTEM, the Explorer.exe temporary is killed and after a few seconds restarted, so there seems to be a bug, we have used system account successfully on previous iTunes versions without this issue.