Describe the bug
ClickHouse doesn't return affected rows via MySQL protocol for INSERT queries after 20.5+

How to reproduce
i create clear docker-compose environment for reproduce behavior MySQL + clickhouse + php + python
https://gist.github.com/Slach/aa67440ce856a3a53f64f92eeddfbc1b

Queries to run that lead to unexpected result

INSERT INTO default.t1(n) SELECT * FROM numbers(1000)

Expected behavior
MySQL protocol shall return affected rows field for INSERT queries (it works successful in 20.3 and 20.4)

Actual behavior