She's had health issues and then had surgery last year for something she had kept putting off or not taken seriously. Read somewhere the health issues are why the panels got less and less detailed over the years. Which makes sense, at this point I just appreciate her continuing on and possibly finishing the story.
There is also the chance of getting a complete version once the recompilation book is out, if these chapters are from the monthly publication is normal to be "more empty"
It also happened with the chapters around the 30 or 50, if you read the monthly it was almost all white and some characters barely tinted then on the recap book (tankenboun I think?) Or was all the detail done
As much as I enjoyed this story and its characters, it's getting to the point where I'm starting to feel kind of bad for the author. Most of the panels now are empty and lifeless. There's no backgrounds, no details or shadows, no screen tones. It almost feels like line-art. Is the mangaka getting too old? Does she have no one helping her? Or is she just tired of the story? Whatever is going on, the art just doesn't feel like it has the same heart in it, and it's very saddening.