if a beacon is not disabling this is mostlikely the error (espcially using scxe)
the beacon has become stacked. in scxe, it's very easy to stack beacons. to check, drag the beacon area and check the bottom it should display the units name, if not, you have more than 1 unit and in this case most likely more than 1 beacon.
Ps. giving vision and back is one of the fastest ways too XD