Rear Left Suspension Noise

Have PASM, When going fast over humped/raised road for train track as the suspension is unloaded there is a noise from the rear left sort of like metal to metal.

Jacked the rear of the car as I force the wheel up and down with a long stick notice the bottoming noice as i let it down, righ side same the test is smoth as i release the down motion.

Feels like if the shock is hitting a limit as it extends. No Codes.

Do I have a damages of bad shock?

Thanks

Carlos