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The output you're seeing is what one would see if the pipe symbol were to be quoted.
grep -n '^PAX_PAYLOAD:$' $0 '|' cut -d ':' -f 1

Seeing the entire script and knowing exactly how it's invoked...

The z/OS shell expects an EBCDIC environment. The pipe is a variant character (one of 13 widely-used characters that can vary between EBCDIC flavours) which is represented by different bytes values...