On 1 June 2019, a Boeing 737-800 was instructed to go around after it was observed to be significantly below the vertical profile for its RNAV approach as it reached the procedure minimum descent altitude. Having then climbed less than 300 feet, the aircraft began to descend, reaching 457 feet agl before resuming its climb. The Investigation found that the terrain proximity on approach followed a failure to discontinue a comprehensively unstable approach and the terrain proximity episode during the go around was due to continued following of the Flight Director which was providing guidance based on incorrect mode selections.