Mangadex has started nuking manga chapters, I heard around 800 chapters have been removed including the one's mentioned below

https://mangadex.org/title/31067b1a-f95e-4c09-b4d6-26373118a9f2

https://mangadex.org/title/8dd57823-d541-4976-b4b0-5654fd7f01f6