* Fix `ALTER TABLE ... UPDATE` query for tables with `enable_mixed_granularity_parts=1`. [#6543](https://github.com/yandex/ClickHouse/pull/6543)([alesapin](https://github.com/alesapin))
* Fix NPE when using IN clause with a subquery with a tuple. [#6125](https://github.com/yandex/ClickHouse/issues/6125)[#6550](https://github.com/yandex/ClickHouse/pull/6550) ([tavplubix](https://github.com/tavplubix))
* Fixed an issue that if a stale replica become alive, it may still have data parts that were removed by DROP PARTITION. [#6522](https://github.com/yandex/ClickHouse/issues/6522)[#6523](https://github.com/yandex/ClickHouse/pull/6523) ([tavplubix](https://github.com/tavplubix))
* Fixed issue with parsing CSV [#6426](https://github.com/yandex/ClickHouse/issues/6426)[#6559](https://github.com/yandex/ClickHouse/pull/6559) ([tavplubix](https://github.com/tavplubix))
* Fixed data race in system.parts table and ALTER query. This fixes [#6245](https://github.com/yandex/ClickHouse/issues/6245). [#6513](https://github.com/yandex/ClickHouse/pull/6513)([alexey-milovidov](https://github.com/alexey-milovidov))
* Fixed wrong code in mutations that may lead to memory corruption. Fixed segfault with read of address `0x14c0` that may happed due to concurrent `DROP TABLE` and `SELECT` from `system.parts` or `system.parts_columns`. Fixed race condition in preparation of mutation queries. Fixed deadlock caused by `OPTIMIZE` of Replicated tables and concurrent modification operations like ALTERs. [#6514](https://github.com/yandex/ClickHouse/pull/6514)([alexey-milovidov](https://github.com/alexey-milovidov))
