I love to admonish folks for not reading their owner's manuals. I'm just as guilty as everybody else.
However, I learned something new when contemplating the OP's issue.
I was reminded that for '18-'19 DCT Wings, to
CORRECTLY engage the parking brake, the owner's manual states, (FIRST) "
Squeeze the front brake lever and (THEN) pull the parking brake lever back to lock the rear wheel", p.60.
For the few times I've used the parking brake, I've just pulled up on the handle. Now, I know I have to squeeze the brake lever first and hold it while pulling the brake handle.
I need to follow my own advice. RTM
Tim