Update content-collections.mdx

[f33w]

.default() custom validation in zod triggers error

The error occurs only using referenced collection. I made a demo:
https://stackblitz.com/edit/github-e7qgsrxj?file=dist%2Fpost%2Findex.html

My discord:
twel

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[sarah11918]

Thanks for letting us know about this! I will ask @ascorbic to take a look and let us know if this is expected behaviour that should be documented, or unexpected behaviour that should instead be fixed in collections! (We don't update docs for e.g. bug fixes, we fix those! So I'll let Matt give us some guidance here.)

[ascorbic]

Is reference().default() something that previously worked? I'm not sure what it's meant to be achieving.