So I heard back from Lenovo (Germany) and they suggested rolling back to the previous BIOS-version.
Please disable BIOS rollback and then try setting your BIOS to an older version.
We do not test our systems with Linux operating systems, only with Windows. Therefore, I cannot tell you for sure whether there will be a BIOS or firmware update available soon to fix your problem.
While the suspend-thingy bothers me, I think I don’t want to roll back (the guide I saw seemed like hell haha) so I’ll see if there will be another solution. 