For Titans, they finished the two other episodes. We don't know why they scrapped the Starfire episode, but it's likely because it spoils the "twist" of her reason for coming to earth, and we know they're shifting over and re-working the original final episode to be the first episode of season 2 since it originally dealt with a time skip where Raven trains in order to defeat Trigon, and they needed to adjust since they got a second season
. For Swamp Thing they just got informed they needed to wrap it up while they were still working on filming the other episodes. Very different.>>107853416
Pushed back to July 2nd.