Why would he attack boro when naruto is in the bowl? Kawaki's all quiet when he was being accused with Boruto being the one defending him.
They discuss the progress of Boruto's Karma before Boro is called away.
Jigen blocks and avoids their attacks, and kicks Sasuke out of Susanoo.
That's not out of character for him erring on the side of caution.
Manga readers are not allowed to comment here! And I do have some nitpicks like why did they even stick around that dimension? He asks what they will gain if they destroy the plan.
But Sarada got Boro good.