Debian's autofs - or why is it always me??

After a few hours trying to get autofs [EN] 4.1.3-4 (Debian testing) to automagically unmount expired mountpoints, I took consulting the Debian BTS [EN] into consideration. Downgrading to 3.9.99-4.0.0pre10-1 really helped, so it was not my fault which relieves me. Now my autofs is working as it should.

Memo to myself: Always check BTS first before wasting precious time.