Symlinked App Directory

I am using a symlinked directory within my app folder. This symlink 404's in development, but works perfectly in production.

Reproducing

Running next dev and visiting localhost:3000/test1 will 404 NOT FOUND.

However, running next build and next start and visiting localhost:3000/test1 will load just fine.

Clearly, due to src/features/test1/app/test1/page.tsx being accessible in production builds, it should also be accessible via next dev.

Areas to Investigate

Why is this symlinked folder incorrectly resolving in next dev, but resolving just fine in next build?