Sensor Range is reset after each Reload
A similar topic already exists, but the problem is bigger than stated there. Not only when you copy and past (haven't tried this one but is written in other bug report) but every time you load a world aka start playing all sensors have their range modified: All entries below 1 are set to 1. This can be so annoying! You just cannot build things that require a sensor range of less than 2m (both directions in a given dimension) that way.