ERP_Ln9.ne4_ne4.FC5AV1C-L test failed on Summit with PGI 19.9 compiler

SUMMARY of cprnc:
A total number of 414 fields were compared
of which 191 had non-zero differences
and 0 had differences in fill patterns
and 0 had different dimension sizes
A total number of 0 fields could not be analyzed
A total number of 0 time-varying fields on file 1 were not found on file 2.
A total number of 0 time-constant fields on file 1 were not found on file 2.
A total number of 0 time-varying fields on file 2 were not found on file 1.
A total number of 0 time-constant fields on file 2 were not found on file 1.
diff_test: the two files seem to be DIFFERENT

The same test on Compy with PGI 19.10 passed.

Start by reproducing the ERP_Ln9.ne4_ne4.FC5AV1C-L test on Summit with PGI 19.9 and compare its cprnc output with the passing run on Compy using PGI 19.10. Investigate why 191 of 414 fields differ; done means identifying and fixing the compiler or platform cause, or documenting the confirmed cause and workaround.

Written by the indexing model from the issue text.