Given its narrative proximity to issues 20 and 21, the scouting expedition in Darth Vader: Dark Lord of the Sith 22, showcasing several Mustafarians including Rrrn, is dated to 14 BBY. The rationale is that Darth Vader's knowledge displayed in issue 18 concerning Tarkin necessitates the prior occurrence of the novel Tarkin, which is set in 14 BBY. Furthermore, because Issue 19 includes the Second Sister, it must precede Star Wars Jedi: Fallen Order. The game Fallen Order is also situated in 14 BBY, due to her death within its storyline. Considering the close sequence of the three issues following issue 19, it's reasonable to conclude that Darth Vader: Dark Lord of the Sith 22, and consequently the Mustafarian scouting operation, are both situated within 14 BBY.
I was advised by another member to make this edit before I edited the page, considering this is a status article. Please let me know if this is not correct. --Mr Star Wars Amino Republic (talk) 15:45, February 13, 2020