2147434 - DROP and CREATE USER causes "Secondary server cannot maintain catalog sync." - SAP IQ

Customer got an emergency shutdown of secondary node during recreating a user account which could not log on the secondary node.  It's reproducible issue.
Followings are scenarios what customer faced and executed.

 [ iqmsg of secondary node at the moment of emergency shutdown ]
     ...
     I. 01/07 16:51:36. 0006082192 Txn 453226632 0 443956756
     I. 01/07 16:51:36. 0006082192 Shared IQ Store update DDL statement:
      CREATE user "user001" identified by encrypted 0x01430EE2F37718E27E20....
     I. 01/07 16:51:36. 0006082192 Disposition: SQLSTATE:WW101  [ No recovery!! ]
     I. 01/07 16:51:36. 0006082192 ***Emergency Shutdown***
     I. 01/07 16:51:36. 0006082192 Exception Thrown from db_iqutility.cxx:4038, Err# 46, tid 70 origtid 70
     I. 01/07 16:51:36. 0006082192    O/S Err#: 0, ErrID: 1025 (db_catalogException); SQLCode: -1009413, SQLState: 'QCB11', Severity: 23
     I. 01/07 16:51:36. 0006082192 [21051]: Secondary server cannot maintain catalog sync.
     -- (db_iqutility.cxx 4038)
     I. 01/07 16:51:36. 0006082192 sp_mpxprocesstlvlog exception, SQLSTATE=QCB11 [Secondary server cannot maintain catalog sync.
     -- (db_iqutility.cxx 4038)
     ...
 
   Customer reported that this symptom has tooken place from time to time and wanted to know the root cause.

SAP IQ 15.4

SAP IQ 16

"SQLSTATE:WW101", "sp_mpxprocesstlvlog exception", "cannot maintain catalog sync" , KBA , BC-SYB-IQ , Sybase IQ , Problem