Oh that explains a lot.
LN manga adaptations are weird, either they take forever to adapt the LN, or skip over details to rush to key parts.
Or they end suddenly with a "Go buy the LN to see the rest of the story" ending.
Alas, that last one makes... A depressing amount of sense when you realise how long some of them are. The mangas would rival One Piece for length at times, and, to make it worse, sometimes, the manga gets further than the WN/LN did.
Can't remember how long this one is, lemme check.
151 chapters for main story, they started writing the "Chapter" 2 (Yes, it's confusing, episode, chapter, chapter...) this year... That ain't too bad, but we're at Ch. 7 in the WN. But yeah, I've seen some (especially VRMMO ones) that are 1500+ chapters, and still going.
I'm just happy if they find a good stopping point, rather than the abrupt type.