KILL command is replicated as TOI replication in galera cluster. If KILL is issued inside a transaction, the galera side transaction context is lost.
This issue surfaced by RQG grammar testing for MDEV-29684
As a fix, consider implicit commit for the surrounding transaction before KILL execution.
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Major
The fix has been merged with the head revision: https://github.com/MariaDB/server/commit/cf0c3ec27458523cdab9a756943db40bbdcad55f + https://github.com/MariaDB/server/commit/95d285fb752dcf0f80045e7a24d9c417d6ffbb1b