"filter_by" query returning non-matching results

I'm doing a basic request on a field:

{
  "q": "*",
  "filter_by": "option_section:=`140 x 140 mm`",
  "page": 1,
  "per_page": 10,
  "exhaustive_search": false
}

But the results don't match the request (see file attached with the first page of results).
It does work for some other section values.

export.json

After some tests, it seems that the exact term search (with "`") doesn't work as expected.
If I change the "option_section" value with "140 x 141 mm" and re-launch a request, the proper documents are found.

Typesense version

• Tried on v28.0 and v27.1
• Tried on a freshly new created collection on v28.0 and an old on with v27.1 and v28.0
• Collection (the name differs from the results but it is the same collection that I recreated) : product.json

Reproduce the request from the issue using the attached product.json collection data and compare the results with export.json. Investigate exact-term filtering for option_section values containing "140 x 140 mm" and verify that the completed fix returns only documents matching that value.