Powerslave [Madness] - timed objective bugged

I'm trying to get the 3rd skull in the Powerslave quest in madness difficulty. The objective is "Win in 300 seconds" but I finished the level in less than 4:30 (270 sec) and I don't gent the skull. It happened twice... :(

Here's a video showing the issue
https://youtu.be/-h74h-jF85k

Thanks for reporting this, and for the video especially, that's really helpful. The game team is investigating.