UPP: Problem processing old GFS nemsio data.

I'm trying to convert GDAS nemsio data from May 2019, which is the old GFS before FV3.

The unipost program broke with printouts "wrong reduced grid - execution skipped".

With the same script settings, I was able to successfully process the latest GFS nemsio though.

Wondering if anyone has experiences with this and can provide suggestions.