You've seen this. The story starts out good. Then somewhere along the way it veers left. Then it gets back on the track. There are time skips. There are characters that drop in from left field. There is a situation that suddenly cropped up no one saw coming. High drama. Then-BOOM-the end.
Um...whut?
To throw this in with no explanation or expanding on how it relates to the story or rush an ending simply because you can't figure out what to do with the story is just bad writing. With so many articles, books, videos, etc on plot development there is just no excuse for it. Plug those plot holes.
I've heard several well published and successful authors offer this piece of advice:
Start your story at the end and work your way back. You know what the end will be so it's a matter of paving the way for the characters to get there.

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How to Irk a Reader as a Writer
HumorJust random thoughts about things that writers do that irk me as a reader. Fueled by caffeine, lack of sleep, or reaction to something I've read. Take none of this serious! Be offended at your own risk.