Yeah, Season 4 is acknowledged for compressing a lot of the story that would have been Season 5 in the original plan. The series finale ("Sleeping in Light") was even shot as a part of Season 4 and delayed once Season 5 was picked up to keep it the series finale. The epilogue it tells spins out enough past the show that it mostly isn't that noticeable, but the big tell is a brief appearance of Ivanova rather than Lochley, which doesn't really break the episode because of the out-of-order storytelling of the whole episode and the glimpses of the crew are "timeless" flashbacks, but it is interesting.