### ClickHouse release v21.8.8.29-lts FIXME as compared to v21.8.7.22-lts

#### Bug Fix
* Backported in [#29128](https://github.com/ClickHouse/ClickHouse/issues/29128): Fix bug in `clickhouse-keeper-converter` which can lead to incorrect ZooKeeper log deserialization. [#29071](https://github.com/ClickHouse/ClickHouse/pull/29071) ([小路](https://github.com/nicelulu)).

#### Bug Fix (user-visible misbehaviour in official stable or prestable release)

* Backported in [#29262](https://github.com/ClickHouse/ClickHouse/issues/29262): Fix invalid constant type conversion when nullable or lowcardinality primary key is used. [#28636](https://github.com/ClickHouse/ClickHouse/pull/28636) ([Amos Bird](https://github.com/amosbird)).
* Backported in [#29106](https://github.com/ClickHouse/ClickHouse/issues/29106): Fix waiting for mutation with `mutations_sync=2`. [#28889](https://github.com/ClickHouse/ClickHouse/pull/28889) ([Azat Khuzhin](https://github.com/azat)).
* Backported in [#29357](https://github.com/ClickHouse/ClickHouse/issues/29357): Fix possible `Table columns structure in ZooKeeper is different from local table structure` exception while recreating or creating new replicas of `ReplicatedMergeTree`, when one of table columns have default expressions with case-insensitive functions. [#29266](https://github.com/ClickHouse/ClickHouse/pull/29266) ([Anton Popov](https://github.com/CurtizJ)).
* Backported in [#29447](https://github.com/ClickHouse/ClickHouse/issues/29447): Fix failed assertion in ReadBufferFromHDFS. Update libhdfs3 library to be able to run in tests in debug. Closes [#29251](https://github.com/ClickHouse/ClickHouse/issues/29251). Closes [#27814](https://github.com/ClickHouse/ClickHouse/issues/27814). [#29276](https://github.com/ClickHouse/ClickHouse/pull/29276) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Backported in [#29303](https://github.com/ClickHouse/ClickHouse/issues/29303): Fix connection timeouts (`send_timeout`/`receive_timeout`). [#29282](https://github.com/ClickHouse/ClickHouse/pull/29282) ([Azat Khuzhin](https://github.com/azat)).