Reader-wise, I would rather read a full length chapter than a chapter chopped into numerous parts. It's a pain to read a chopped chapter knowing that you only invested your time knowing nothing, learning nothing. The story didn't progress, and you still have to read the other parts to fully learn what the chapters were all about, thus wasting more time.
You can divide sub-plots and entire arcs, but a scene dedicated for a single chapter? I don't think so. Like the aforementioned stuff and glaring evidences as to why you should not cut up a chapter, the story itself just lose cohesion and a slog to read in general. It's also bad in a way that the readers might think of you as a cheap, petty person adding crap-tier cliffhangers here and there.
On the other hand though, 4k chapter is a bit extreme honestly for an average reader, as it would take nearly a quarter of someone's hour assuming they wanted to read the chapter word-by-word and not miss out on any important details. I initially would suggest trimming it down though upon quick searching your name on Google and your novel up on Syosetsu, majority of your words came from dialogues. I'd say It's all good honestly, unless you're writing a 4k exposition hell.
If you do really want to trim down your chapters, I would say cutting/trimming down the dialogues and overexplanations although it's probably not your type of prose and tad too much to boot. More importantly, your characters would lose their color and the banters between each other so only try this as a last resort.
This is just my opinion though, and hopefully you will find the best option in the end!
