TFMini: Copter does not stop climbing

I posted this in the Lidar lite v3 offset value issue thread, but this thread seems to be more alive.
" I have just purchased a Garmin Lidar-Lite V3 with a manufacture date of 2019/02. I have used a Maxbotix sonar on a Tarot Iron man 650 with a pixhawk 2.1 Cube (Black) (Recently replaced by Profinc). I replaced the sonar with a TFmini which sorta seemed to work, but there was confusion around the rangefind max point. I have experienced runaway climb in AltHold. I thought the greater range of the Lidar Lite V3 would help, but this discussion has given me pause. The mission for the craft is sheep herding in AltHold, and if the AP is suddenly told that Alt has jumped up, it could be very dangerous. This discussion seems to be circular among several venues and threads with no apparent resolution. Does anybody know where it stands?"
Phil