typesense group_by pagination stops returning results beyond some limit in Typesense

Bug Description

When using group_by with a high number of unique groups, Typesense only returns results up to the max_query_groups limit. Requests for higher page numbers return empty grouped_hits, even though there are more unique groups available in the collection.

Reproduction Steps

curl -X GET "http://TS_URL/collections/products/documents/search"
-H "X-TYPESENSE-API-KEY:API_KEY"
-G --data-urlencode 'q=*'
--data-urlencode 'query_by=product_id'
--data-urlencode 'filter_by=(brand_name:="Nike")'
--data-urlencode 'per_page=10'
--data-urlencode 'page=12'
--data-urlencode 'group_by=product_id'
--data-urlencode 'group_limit=1'
--data-urlencode 'sort_by=product_id:asc'

Expected vs Actual

It should give result for page 12, give 10 records

Actual behavior
{"facet_counts":[],"found":13061,"found_docs":51947,"grouped_hits":[],"out_of":435977,"page":12,"request_params":{"collection_name":"products","first_q":"","per_page":10,"q":""},"search_cutoff":false,"search_time_ms":96}

It gives grouped_hits as blank, for page 11 it works.

Environment

Typesense version: e.g. v29.0

Schema / Configuration

Include any relevant schema definitions, JSON payloads, or config files:

schema = {
            "name": "products",
            "enable_nested_fields": True,
            "fields": [
                {"name": "id", "type": "string", "facet": True, "sort": True},
                {"name": "product_id", "type": "string", "sort": True},
       {
                    "name": "images",
                    "type": "object[]",
                    "fields": [
                        {"name": "product_image_id", "type": "string", "sort": True},
                        {"name": "is_primary", "type": "bool", "sort": True},
                        {"name": "large_url", "type": "string"}
                    ]
                },

                {
                    "name": "store_details",
                    "type": "object",
                    "fields": [
                        {"name": "store_id", "type": "string", "sort": True},
                        
                    ]
                }
            ],
            "default_sorting_field": "price_amount",
            "num_shards": 4,
        }