There's the Red Skies Crossover, where a huge, cataclysmic status quo shaking event is barely acknowledged in works set in the same universe around the same time frame. And then there's this trope which goes way beyond that to its logical extreme: a work in a shared universe isn't affected by a massive change in the status quo.
Maybe it's a work where the author has a lot more creative control than the studio. Maybe the work only exists in Broad Strokes compared to the rest of the universe. Or maybe the writers of the work don't feel like including the particular event in their work.
Whatever the reason may be, the work is completely isolated from the massive event taking place in the rest of the universe. Not even red skies, not even a token mention of the event, nothing.
- The trope name comes from the fact that the Marvel Cinematic Universe Netflix shows (Daredevil, Jessica Jones, Luke Cage and The Punisher) weren't affected by the Snap in Avengers: Infinity War, which happened at the same time as the last seasons of those shows. Likewise, Agents Of S.H.I.E.L.D. doesn't seem to be affected by the five years Time Skip in Avengers: Endgame or the Blip (aka the Unsnap). Runaways and Cloak and Dagger aren't affected by the Snap, the Time Skip or the Blip. Helstrom is likewise confirmed to not be affected by the Snap, the Time Skip or the Blip.
- Masked Rider is part of the main Power Rangers universe, yet the show was never effected by the massive invasion of Earth in Countdown to Destruction. Furthermore, while the Megaforce Rangers get keys to all the past Rangers, they never get Masked Rider keys, nor is Dex seen in the final battle in Super Megaforce.
- Atop the Fourth Wall depicted the Entity "absorbing" the entire Channel Awesome Universe...yet none of the other shows were ever shown to be affected by it.
- None of the characters from Kong: Skull Island seem to be affected by the events of Godzilla: King of the Monsters. Skull Island and Kong do get namedropped a few times, yet when the time comes for all the Kaiju to be summoned in order to destroy the Earth, Kong and the Skrull Crawlers are noticeably absent.
- Doctor Slump never acknowldged all the times in the Dragon Ball franchise where either the Earth got destroyed, or the Moon got destroyed.
- While Crisis on Infinite Earths (the Arrowverse event, not the comic book) acknowledges most of DC's live action properties, it completely ignores their animated ones (unless you consider the evil Kevin Conroy Batman that shows up the Justice Lord Batman). Meaning, we have no idea if the DC Animated Universe , the DC Animated Movie Universe, Superfriends, Gen 13, Wild C.A.T.S., Teen Titans, Teen Titans Go! , Batman: The Brave And The Bold, Beware the Batman, Young Justice, Green Lantern: The Animated Series, Krypto the Superdog, Justice League Action or The Batman were affected by the Anti-Monitor. Likewise, Gotham, Krypton, Lois and Clark, The Adventures of Superman (which should have been a possibility considering they did acknowledge the 60s Batman show), The Kid Superpower Hour with Shazam, Superboy, Human Target (both shows), Watchmen (both the movie and the TV show), Red, The Losers, Joker, Swamp Thing (either the movies or the two TV shows), Steel, Constantine (the movie) and The Dark Knight Trilogy are completely absent from the live action DC properties involved in the crossover.
- Legends of Tomorrow features an alternate timeline where the Fates took over Earth. We are never exacty how they managed to defeat Barry, Kara, Kate and Jefferson, and neither of the four actually show up in the episode.
- Stargirl is supposedly an Arrowverse show, yet the show itself never gives any indication of being so. Notably, this show's version of Jay Garrick is killed by the Injustice Society, and this somehow escapes the notice of both Barry and the Earth-3 Jay Garrick, even though the Speed Force gives its users My Significance Sense Is Tingling powers.
- Despite being established as being part of the Ghostbusters Multiverse, Filmation's Ghostbusters are completely absent from Ghostbusters Crossing Over .