Trolling Creator: Ending Part 4/4 on a cliffhanger and stated it'll be continued in Part 5/4? Yeah, that's fits the bill alright. Although Word of God did confirm that the main reason to end it this way was practical; the conclusion would have been too long otherwise.
"The reason there is a part 5/4 is because it simply got way too long. Heck, part 5 still is probably going to be the longest part even being split like this. I really want to take my time on this part as I've seen lots of stories be ruined by a sloppy ending."