WA, that's no urban legend and I find your response kinda surprising because you and I discussed it while you were helping me with my hammer following the bolt problem last year (all's "Happy" now, thanks!)
Call Marlin, explain what happened (lever jammed in the wide open state, had to remove lever to unstick) and they offer to send you the new lifter as the solution. Happened to mine and it was easy to see the groove worn into the lifter. I detail strip the gun every time I shoot it (hate gunk in the action), so I can't say it was a maintence problem. I have about 2500 rounds in the gun since getting the second lifter, and it's showing the same groove.
This is my only complant with my favorite gun.