It happened with this tweet from Jump+'s official account

Machine translation:

Shueisha Inc. has terminated its outsourcing of editorial and related services to Mix Green Co., Ltd. effective July 31, 2026. Consequently, all contractual relationships with Mr. Lin Shihei, an editor employed by Mix Green, have also been terminated.

Regarding the works published in “Shonen Jump+” that Shueisha had entrusted to Mr. Lin, serialization will continue in “Shonen Jump+” under a new organizational structure. We ask for the continued support of our readers, authors, and all related parties.

Please note that submissions of new works and proposals for projects intended for Shueisha’s various media outlets, including “Shonen Jump+,” will continue to be accepted through the official contact points for each respective Shueisha publication, as before.

Shueisha Inc.
Shonen Jump+ Editorial Department

It used a harsh tone for “terminated” in the original text and pointed specifically at Lin Shihei by name, causing speculation that Shueisha was angry with the former employee, who left the company in 2022 and founded Mix Green Co. Ltd…

Rin did not respond to the termination directly, just posting on X that Mix Green will continue to edit the 4 currently running mangas by entering direct contracts with the authors.

・『SPY×FAMILY』
・『ダンダダン』(Dandadan)
・『ケントゥリア』(Centuria)
・『WITCHRIV』

It is not clear what the contract between Shueisha and the mangakas are, whether the publisher will have further editorial power over these works. I guess we’ll have to wait and see if the situation develops more.