3129892 - db2ckbkp reports ' Tablespace page size inconsistent'

Following a successful database backup you run the 'db2ckbkp' utility to test the integrity of the backup image.   The following error is reported indicating a tablespace inconsistency.

db2ckbkp /db2/db2backup/20210806-214901_SAP/SAP*
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###ERROR - Tablespace page size inconsistent for tablespace ID 28.
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### Image Verification Complete - ERRORS DETECTED: 1
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You then examine the tablespace using the 'db2dart' utility to find that there is no inconsistency.
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db2dart DB6 /TS /tsi 28 /RPTN DB2DART_SAP_TBSPACE.RPT
Action option: TS 
Tablespace-ID: 28
Creating the agent environment...
      Tablespace file inspection phase start.
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Table inspection end.
Tablespace inspection phase end.

The requested DB2DART processing has completed successfully!
All operation completed without error;
no problems were detected in the database.
Complete DB2DART report found in: DB2DART_SAP_TBSPACE.RPT
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• Db2 (DB6) v11 releases prior to Db2 11.1 M4 FP5

IT26753 , KBA , BC-DB-DB6 , DB2 Universal Database for Unix / NT , BC-DB-DB6-DBA , Database Administration , Problem