gossip girl went on break when titans started airing, and doom patrol started airing on like the last week of titans. doom patrol just had its season finale. so it's weird gossip girl isn't coming back right away and instead it's still like 2 weeks away.
and the show was supposed to air on the cw, but then they changed their minds last minute and decided it's just air on hbomax. so my assumption is that because gossip girl wasn't meant to air on hbomax, when the already scheduled programming for it started(titans and doom patrol) they had to put the season on break. and now those shows have ended so they're bringing gossip girl back