This issue is caused by a wrong value being picked for a newly introduced option PGNMDGTS from an older options file.
Specifies the number of digits in the PAGE number.
Default: 5 (on z/OS)
5 digits use the mask ZZ,ZZ9
Default: 7 (on Unix, Linux, and Windows)
7 digits use the mask Z,ZZZ,ZZ9
This is a compile-time option.
The customer has an older options file from which PGNMDGTS picks a value 0 because this option was non-existent in the past and the respective field was initialized to a 0 in the old options file. This causes the truncation of the page numbers above a single digit.
As an immediate solution for the customer, Creating a new options file will solve this problem as PGNMDGTS would be defaulted to 5.
Later, we will publish a PTF to resolve this issue being caused for old options files.
You could also run JOB06OP2, which has the following DD statement: for example
//OPTBLD.SYSIN DD *