Multiple issues are combined.
Vercel and Cloudflare Build Errors
On Cloudflare's side:
16:49:17.136 ✔ Server: Compiled successfully in 3.74m
16:50:22.579 Segmentation fault
16:50:22.595 Failed: build command exited with code: 139
16:50:23.859 Failed: an internal error occurred
On Vercel's Side:
[success] [webpackbar] Server: Compiled successfully in 3.49m
Error: Command "yarn run build" exited with 129
Why..? I changed no config
Investigating RAM Options. Supported a ticket to Cloudflare
Did not help.
OH FIGURED IT OUT. It was because of insufficient RAM. When Docusaurus seals the assets (at the end of the build cycle), the RAM usage spikes to ~4.5 GB.
— Nope. Did not solve the problem.