filter_by not preserved on search page

Description

I'm running:

• typesense v27.1
• docusaurus-theme-search-typesense v0.22.0
• docusaurus v3.5.2

My index contains documents with some version tagged v1 and others v2.

I don't want to see my v1 docs when I search (I use it for something else).

I'm using the following config:

      typesense: {
        // Replace this with the name of your index/collection.
        // It should match the "index_name" entry in the scraper's "config.json" file.
        typesenseCollectionName: process.env.TYPESENSE_INDEX_NAME,
        typesenseServerConfig: {
          nodes: [
            {
              host: process.env.TYPESENSE_HOST,
              port: process.env.TYPESENSE_PORT,
              protocol: process.env.TYPESENSE_PROTOCOL,
            },
          ],
          apiKey: process.env.TYPESENSE_API_KEY,
        },

        typesenseSearchParameters: {
          filter_by: "version:=v2",
        },

        // Optional
        contextualSearch: true,
      }

I've a perfectly working sidebar search.
But I see all results v1 + v2 results. I'll like to see only v2 results.

Steps to reproduce

• setup a typesense index
• add documents with version v1 and version v2

Expected Behavior

See consistent results between the search bar and the search page.

Actual Behavior

I see all results, my filter_by parameters not preserved on multi_search query on search page.

Metadata

Typesense Version: v27.1

OS: linux/amd64

Start by tracing how the configured typesenseSearchParameters reach the search page's multi_search query, comparing that path with the working sidebar search. Reproduce with documents tagged v1 and v2 and verify that filter_by version:=v2 is preserved so both interfaces return only v2 results.