>>23500332
For the last theatrical movie, The Beginning, Toei released a simplified timeline graphic and decided to omit Tri.
Fans took this as face value and proclaimed the staff hate Tri and removed it from the timeline.
Which isn't true because Tri was mentioned as part of the same timeline in an interview with the movie's producer, and in the previous movie, Kizuna, Meiko and Meicoomon, Tri's main characters, show up briefly.
Finally in Beyond, Meiko and Maki, another character from Tri whose fate was unknown, have brief cameos, possibly as a way to make up for the lack of mention in the timeline graphic.
If staff truly regretted Tri, there wouldn't be any cameos or mentions at all.