At first I was just confused by their decision to skip chapter 68 and go straight into the bus arc, but the more I think about it, the more I feel like they really, really fucked up by not moving it up to the first episode of the season instead of creating an anime original story.
>chapter features all the Forgers + Yuri, second half features Franky, Fiona, and Handler
>all characters would also be featured in the last episode of the season, assumed to be 86 + 87
>bottle episode that doesn't connect directly from or to any other story
>still sets up Yuri and Loid's dynamic for the later arcs
>establishes Yuri as both Twilight's foil before the bus arc and rival before the mole arc
>has Loid growing less patient with Yuri before he finally yells at him in the mole arc
>makes light of Yuri's rivalry with Loid so his statements about tailing him for fun and making Yor sad with his arrest show his view of Loid changing
Putting it anywhere after the bus arc hurts the progression and messes up the way Axeman really started pushing Yuri as a real threat to Loid around this part of the story.