Search: inconsistency with count, page_count and the number of products.

[monsieurtanuki]

What

• A test's just started to fail in off-dart: https://github.com/monsieurtanuki/openfoodfacts-dart/actions/runs/6819142523/job/18546019680
• It looks like the data we get from the server is not 100% coherent in some rare cases.

Steps to reproduce the behavior

https://world.openfoodfacts.org/cgi/search.pl?lc=en&tags_lc=en&fields=code&tagtype_0=creator&tag_contains_0=contains&tag_0=monsieurtanuki&page_size=1000&search_terms=&json=1&api_version=3

{
    "count": 6,
    "page": 1,
    "page_count": 5,
    "page_size": 1000,
    "products": [
        {
            "code": "8032597603380"
        },
        {
            "code": "07790386"
        },
        {
            "code": "1407178902"
        },
        {
            "code": "9786756453"
        },
        {
            "code": "1407178901"
        }
    ],
    "skip": 0
}

Expected behavior

• We expect count and the recent (?) page_count to be identical, and equal to the number of retrieved products, which is 5 in that json.
• Here, count is 6, page_count is 5 and there are 5 products.

[stephanegigandet]

It may be a caching issue, I get a count of 6 with caching, and 5 without caching. We currently have different caches for the counts and for the results.