Upgrading to "next":"15.5.2"
resolved this issue.
Better worker management also:
anonymous 357421 0.1 0.5 9425680 83636 pts/0 Sl+ 16:19 0:00 node node_modules/.bin/next dev
anonymous 357438 0.5 1.3 28604720 216060 pts/0 Sl+ 16:19 0:01 next-server (v15.5.2)