https://www.polygon.com/2018/11/6/18068362/red-dead-redemption-2-disappearing-gang-members-bug

Rockstar has a fix in the works for a bug that makes several members of Arthur Morgan’s gang disappear from camp early in Red Dead Redemption 2, the company said Monday.

After several reports over the past week from players about some of Morgan’s confidants going missing — including major players like Sadie Adler and John Marston — in the game’s second chapter, there are now both workarounds and promises of a solution. Rockstar identified the issue in a support post, explaining what causes these campers to vanish.