For me, it was a component path that was wrong. I created a component with lowercase... and I tried to import it inside another component.

But I realized it has the wrong name, so I changed the component name using the first letter as uppercase. And I forgot to update the path inside the other component. After that, if I changed something, Next was compiling and everything was ok. No errors. But my browser was not showing the changes. It was required to rerun the npm run dev command for each change.

I even restarted my PC but nothing. The browser was not showing the changes even if next was compilation was ok.

Until I realized that the problem was the wrong path to the renamed component. I changes my wrong path and then the browser was showing the changes again without restarting.