The Race won´t start at the Grid

Report-Code: PSDB-BKBS-VG2C-MPHD

I tried to start a race in Grand Prix mode. After selecting the race strategy and standing on the grid, nothing happened.
I discovered by chance that I had to press upshift to start the countdown.

YT: https://www.youtube.com/watch?v=IAJkn2BIwHM