Broncos are the 4th team since the merger to score a TD on the game's first drive and lose by at least 21 points. The others:

2017 NFC Championship
PHI 38, MIN 7

2009 NFC Divisional Playoff 
NO 45, ARI 14

1982 AFC Wild Card
NYJ 44, CIN 17

If not for a missed PAT, the Houston Texans would have joined them with a 52-31 loss to the Chiefs in the 2019 AFC Divisional Playoff.