Stop motor service doesn't work

[hello-chintan]

I am running the sllidar_ros node for RPlidar A1 on my robot that runs on Ubuntu 20.04 with ROS 2 Galactic. The node runs fine but after termination, the lidar motor keeps spinning. The stop_motor service has no effect. Upon investigating, I found that this was not a problem until release 1.7.0 in ROS 1, however, the issue has crept into the ROS 2 package as well thereafter. Could you point to a fix for this?