The latest sequel to 1989s Batman has seemingly brought a new version of the Riddler to the Tim Burton Batman timeline, but this exciting development may have also caused a continuity snarl that will need to be cleared up. John Jackson Millers 2024 novel Batman: Resurrection is set between the events of 1989s Batman and 1992s Batman Returns, and the novel not only combines characters and lore from both movies, it also introduces new characters to the Burton universe. Resurrection is also set in the same timeline as Sam Hamm and Joe Quinoness Batman 89 and Batman 89: Echoes comics.

https://screenrant.com/batman-resurrection-riddler-timeline-plot-hole-explained/