v 2.4 Overriding thrust with sensors and event controllers bugged

Please use my FollowMe drone for testing, found here:

Atmospheric version: https://steamcommunity.com/sharedfiles/filedetails/?id=3790690737

Ion thruster version: https://steamcommunity.com/sharedfiles/filedetails/?id=3780601791

The issue is that when a sensor or event controller is used to override the thrust on a thruster, it can sometimes set it negative instead of positive, causing the spacecraft to go in the opposite direction than intended. I have not found a pattern--it just seems to do it randomly, but it happens often.

In my FollowMe drone examples, I have set the drone to follow the player when the player is more than 10 meters way and less than 50 meters (the maximum range). A button is configured to start the following, but it can also be started on the atmospheric one by triggering the "start follow" timer. At first it may appear to behave correctly, but after a little while it will run away from the player.

This shows an issue with the sensors, but with another build that used an event controller, it had the potential for sometimes setting the override negative, causing the craft to go in reverse. That was on version 2.3, however, and I have not tested since, but I suspect that issue is also still present.