Based on the available evidence, Runaways season 3 B (after the time jump via the Dark Dimension, but before the time travel arc) is set in the same year as the Snap, but some time after it happened.
However, due to the secrecy that surrounded the plots of Infinity and Endgame, Runaways at no point references the Snap, nor suggests that it even happened. This has always been a frustrating continuity issue for me.
In my own personal viewing order, I'd like to place Runaways S3 B (minus the time travel finale) just before Infinity War, parallel or adjacent to (a portion of) Agents of SHIELD S5, Jessica Jones S3, and The Punisher S4.
How could the timeline of Runaways be fudged/shifted such that the penultimate episode of S3 happens just before, or even concurrently with, Infinity War?