@Alex-Kushleyev Thanks. I
suspect the sensor is broken. In QGC I can see the distance_sensor value not making sense, lower values for some things that are further away, etc. I tested it against a second drone, and those values made much more sense, so I believe the Lepton is broken.
Plus, there's a visible discoloration one of the lenses, about 1/3 of it looks green rather than amber.