Responses
Short deadlines and overwork. That's why.
They can't keep the quality having little time to work so the art suffers. It's a common known issue in that industry. Sometimes the stories even get less panels so chapters get shorter to get better art or not as bad. Hiatus is kind of a last resort because it kills the story momentum and they might lose readers.
It's either the artist is having a hard time maintaining the artstyle or they replace the artist
guys the art quality has decreased again, they look so shiny and their proportions are completely off now why is this happening to so many stories