I often see women cyclists edging up on the inside of a lorry or big vehicle at traffic lights, but very gingerly and they don’t push in front of them, they stay to the side, right in their blind spot probably.
Either push through and then out in front of the lorry if sure the lights aren’t about to change, or stay behind.
they are not assertive enough
there is also a problem when the vehicle is occupying the cycle box, as often happens (with buses as well).
I have seen a d*ckhead policeman giving out fines to cyclists who have stopped in front of the cycle box, having crossed the junction line, but ignoring the lorry that had taken up 80% of the cycle box – said it was not an issue when we challenged him.