Apollo Client has null values filtered in queries since v3.9.0 when using a type policy about apollo-client HOT 8 CLOSED

Hi all 👋 This regression is related to the bug fix in #11202. We're looking into it and should have an update soon, thanks for your patience.

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@bengry yes, I can view it now. I'll need to dig into this a bit more and I'm nearing the end of my day, but will take a look as soon as I can. Thanks!

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Just adding a comment here to say we're experiencing the same issue, it appears our defined typePolicies are being ignored and certain types we do not wish to normalise are being erroneously included in the cache, which then breaks several things across our tests and application, and leads to the same behaviour as seen above.

For example, we have a query that returns something similar to the below;

query TermsAndConditions {
  xyz {
    hasSignedTerms
  }
}

Where xyz: XYZ and type XYZ { hasSignedTerms: Boolean! }

Unfortunately the xyz type (obfuscated here) has no identifying label/id we can use, so we employ a strategy whereby it's type is given a keyFields: false value.

In 3.8 this would always mean the data property would return { __typename: 'XYZ', hasSignedTerms: true/false } whereas within 3.9 we are seeing frequent returns of { __typename: 'XYZ' } with the hasSignedTerms property being omitted entirely (which then breaks things as our TS types assume it always exists, etc.).

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I think the same happens with empty lists

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The fix will go out in a next patch release in the next day or two - I've tested snapshot release 0.0.0-pr-11576-20240206204955 with your sandbox @bengry and the bug no longer occurs. Thank you for reporting this issue!

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Hi @bengry 👋 Thanks for providing the reproduction - unfortunately I'm not able to access it:

Would you mind checking that it's shared publicly (assuming that was your intent)? Thanks!

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Hi @bengry 👋 Thanks for providing the reproduction - unfortunately I'm not able to access it:

Would you mind checking that it's shared publicly (assuming that was your intent)? Thanks!

Woops, try again now please

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