The official Twitter account for Daisuke Ashihara’s World Trigger manga has announced that a new chapter of the manga will not appear in the July 2019 issue of Shueisha’s Jump SQ. magazine on June 4, 2019 due to Ashihara recovering from intestinal obstruction complications that arose from his recent cholecystectomy (gall bladder removal surgery). The announcement noted that Ashihara has already been discharged from the hospital, and the manga will resume in the next issue in July 2019.
The manga recently resumed in October 2018 after being on hiatus since November 2016 due to Ashihara’s poor physical health. When it resumed, the manga ran for five issues in Shueisha’s Weekly Shonen Jump magazine before moving to Jump SQ. in December 2018.