Right, it's been a while since I've run into this, so I forgot. As not everything is listed on mangadex, even though that would be very convenient, I will sometimes look into whether a series is continued, or complete elsewhere if chapters are missing on MD.
The problem is that sometimes there are, but the translation is so poor it actually hurts to read. It makes it feel like the translation group might as well have not bothered, but I guess there is an audience that finds it tolerable.