Great Expectations only returns partial failed rows (20)

Hello
We are using Gx to run our data quality checks with result format set to “COMPLETE”. But still we only are receiving 20 records in the unexpected_index_list param.

Version: 1.10.0
Data Source: SQL - Postgres
Expectation we are using: ExpectColumnValuesToBeUnique

result_format = {
"result_format": "COMPLETE",
"unexpected_index_query": True,
"unexpected_index_column_names”: [“primary_key_column”]
}

Similar to this open ticket here: Great expectation is only returning 20 rows of failed records

Can you please tell us what am I doing wrong here.
Why does it not return all the rows that have failed and just 20 ?

Thank You