Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Mongoose version

9.0.0

Node.js version

24.11.1

MongoDB server version

N/A

Typescript version (if applicable)

5.9.3

Description

Trying to access properties of a QueryFilter in TypeScript fails with "Property '<name>" does not exist".

Steps to Reproduce

const filter = { foo: 'hi' } as mongoose.QueryFilter<{ foo: string }>;
filter.foo; // error: Property 'foo' does not exist on type '_QueryFilter<{ foo: string; }>'.

Expected Behavior

In v8, the above code worked without producing an error. I would expect it to still do so.