### ClickHouse release v21.6.3.14-stable FIXME as compared to v21.6.2.7-prestable
#### Improvement
* Backported in [#24531](https://github.com/ClickHouse/ClickHouse/issues/24531): Fix Zero-Copy replication with several S3 volumes (Fixes [#22679](https://github.com/ClickHouse/ClickHouse/issues/22679)). [#22864](https://github.com/ClickHouse/ClickHouse/pull/22864) ([ianton-ru](https://github.com/ianton-ru)).
* Backported in [#24776](https://github.com/ClickHouse/ClickHouse/issues/24776): Avoid hiding errors like `Limit for rows or bytes to read exceeded` for scalar subqueries. [#24545](https://github.com/ClickHouse/ClickHouse/pull/24545) ([nvartolomei](https://github.com/nvartolomei)).
#### Bug Fix
* Backported in [#24727](https://github.com/ClickHouse/ClickHouse/issues/24727): In "multipart/form-data" message consider the CRLF preceding a boundary as part of it. Fixes [#23905](https://github.com/ClickHouse/ClickHouse/issues/23905). [#24399](https://github.com/ClickHouse/ClickHouse/pull/24399) ([Ivan](https://github.com/abyss7)).
* Backported in [#24827](https://github.com/ClickHouse/ClickHouse/issues/24827): - Fixed the deadlock that can happen during LDAP role (re)mapping, when LDAP group is mapped to a nonexistent local role. [#24431](https://github.com/ClickHouse/ClickHouse/pull/24431) ([Denis Glazachev](https://github.com/traceon)).
* Backported in [#24936](https://github.com/ClickHouse/ClickHouse/issues/24936): - If ZooKeeper connection was lost and replica was cloned after restoring the connection, its replication queue might contain outdated entries. It's fixed. - Fixed crash when replication queue contains intersecting virtual parts. It may rarely happen if some data part was lost. Print error in log instead of terminating. [#24777](https://github.com/ClickHouse/ClickHouse/pull/24777) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Backported in [#24851](https://github.com/ClickHouse/ClickHouse/issues/24851): Fix bug when exception `Mutation was killed` can be thrown to the client on mutation wait when mutation not loaded into memory yet. [#24809](https://github.com/ClickHouse/ClickHouse/pull/24809) ([alesapin](https://github.com/alesapin)).
* Backported in [#24916](https://github.com/ClickHouse/ClickHouse/issues/24916): Fix extremely rare bug on low-memory servers which can lead to the inability to perform merges without restart. Possibly fixes [#24603](https://github.com/ClickHouse/ClickHouse/issues/24603). [#24872](https://github.com/ClickHouse/ClickHouse/pull/24872) ([alesapin](https://github.com/alesapin)).
* Backported in [#24952](https://github.com/ClickHouse/ClickHouse/issues/24952): Fix possible heap-buffer-overflow in Arrow. [#24922](https://github.com/ClickHouse/ClickHouse/pull/24922) ([Kruglov Pavel](https://github.com/Avogar)).
