Different params received in unstable_getStaticProps in development and production (ZEIT)

[stefanoverna]

Bug report

Describe the bug

Having a page at /docs/p/[...chunks]/index.js, and visiting ie. /docs/p/foo/bar:

1. in dev the unstable_getStaticProps function receives { params: ['foo', 'bar'] }
2. in production (on ZEIT) it receives { params: [ 'foo/bar' ] }

Expected behavior

I guess { params: ['foo', 'bar'] } is the correct one.

Screenshots

Runtime error on ZEIT:

System information

Version of Next.js: 9.2.1

[balazsorban44]

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