Perhaps this explains the observed action?
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/IGY3LR31/5.2.4
<quote>
BLOCK CONTAINS
0 can be specified for QSAM files. If BLOCK CONTAINS 0 is specified for a
QSAM file, then:
* The block size is determined at run time from the DD parameters or
the data set label. If the RECORD CONTAINS 0 CHARACTERS clause is specified and
the BLOCK CONTAINS 0 CHARACTERS clause is specified (or omitted), the block
size is determined at run time from the DD parameters or the data set label of
the file. For output data sets, with either of the above conditions, the DCB
used by Language Environment will have a zero block size value. If you do not
specify a block size value, the operating system might select a
system-determined block size (SDB). See the operating system specifications for
further information about SDB.
</quote>
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