Project Lorraine...
Um, I wrote the first couple of chapters of Project Lorraine in a rush. IIRC, I got to #4 or #5, had a wonderful idea for the finale, reckoned it would top-out my 'probable' novelette as Chapter #10. I wrote those two crucial scenes, set them aside ready.
Then the main tale took on a life of its own. Phrases turned into paragraphs, paragraphs into pages, pages into chapters. One 'running gag' became two chapters. I wrote and I wrote and I wrote...
I managed to rein-in the tale before it ran out of steam. Well, yes, I lost my nerve. I could have written another 30k, but I was scared I'd fall off the wave and slump into 'Turgid'. Better to stop while 'gold'. Whatever...
I copy-pasted those two scenes, changed some names and had my finale-- now Chapter #30 !!
And, yes, I'd accidentally written my first novel, never mind the surreal style and the niche subject...
Okay, so I got lucky : In my unhappy experience, writing a good chapter out of sequence can kill the tale...
Sometimes it is a beacon of hope.
Often, it torpedoes my confidence-- Like fog clearing to reveal a vast, trackless Canyon ahead of weary explorers...