Brompton G-Line Rear Frame Clip Problems

Has anyone had problems with the rear frame clip latching onto the suspension block when the bike is unfolded ?

https://www.brompton.com/p/1402/frame-clip-for-g-line?srsltid=AfmBOopvrlV29Gj8xJsaVv3kJaRz8I_iITB01Yur2ybrfoM-3dcLQr3R&Color=Black

If the clip does not engage the rear wheel unfolds when the bike is lifted.

My clip has stopped working and taking it to bits I cannot see anything that looks wrong or worn. Grinding the edge of the clip should improve things, but why would that be needed ?