### ClickHouse release v20.8.11.17-lts FIXME as compared to v20.8.10.13-lts

#### Bug Fix
* Backported in [#18442](https://github.com/ClickHouse/ClickHouse/issues/18442): Fix possible crashes in aggregate functions with combinator `Distinct`, while using two-level aggregation. Fixes [#17682](https://github.com/ClickHouse/ClickHouse/issues/17682). [#18365](https://github.com/ClickHouse/ClickHouse/pull/18365) ([Anton Popov](https://github.com/CurtizJ)).