I can confirm, that the star is
not catchable with some cars in
Simulation mode. I've tried it with Dust Mite, and with RC Bandit for example. But it is definitly catchable with bigger cars. I tried it for example with Humma, and with SuperBoss.
I think this should be reported to Huki. I am not sure if he is checking also this sub-forum. If not, maybe you could do a post in the Bug-Report subforum, 607. It would be very interesting, what is causing this.