The fix for MENT-1023 needs to be migrated to the CS version:
Incorrect processing of an auto-incrementing field during applying transactions results in a duplicate key being created. This is due to the fact that at the beginning of the write_row() and update_row() functions, the values of the auto-increment parameters are used, which are read from the parameters of the current thread, but further along the code other values are used, which are read from global variables (when applying a transaction). This can happen when the cluster configuration has changed while applying a transaction (in high_priority_service mode for Galera 4). Further during IST processing duplicating key is detected, and processing of the DB_DUPLICATE_KEY return code (inside innodb, in the write_row() handler) results in a call to wsrep_thd_self_abort().