### ClickHouse release v20.12.8.5-stable FIXME as compared to v20.12.7.3-stable

#### Bug Fix
* Backported in [#20592](https://github.com/ClickHouse/ClickHouse/issues/20592): Fixed inconsistent behavior of dictionary in case of queries where we look for absent keys in dictionary. [#20578](https://github.com/ClickHouse/ClickHouse/pull/20578) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Backported in [#21048](https://github.com/ClickHouse/ClickHouse/issues/21048): Fix usage of `-Distinct` combinator with `-State` combinator in aggregate functions. [#20866](https://github.com/ClickHouse/ClickHouse/pull/20866) ([Anton Popov](https://github.com/CurtizJ)).
* Backported in [#21133](https://github.com/ClickHouse/ClickHouse/issues/21133): Fixed behaviour, when `ALTER MODIFY COLUMN` created mutation, that will knowingly fail. [#21007](https://github.com/ClickHouse/ClickHouse/pull/21007) ([Anton Popov](https://github.com/CurtizJ)).
* Backported in [#21249](https://github.com/ClickHouse/ClickHouse/issues/21249): - Block parallel insertions into storage join. [#21009](https://github.com/ClickHouse/ClickHouse/pull/21009) ([Vladimir C](https://github.com/vdimir)).
* Backported in [#21230](https://github.com/ClickHouse/ClickHouse/issues/21230): Fixes [#21112](https://github.com/ClickHouse/ClickHouse/issues/21112). Fixed bug that could cause duplicates with insert query (if one of the callbacks came a little too late). [#21138](https://github.com/ClickHouse/ClickHouse/pull/21138) ([Kseniia Sumarokova](https://github.com/kssenii)).
