Afte upgrading from Jenkins 1.456 to 1.504 and upgrading the FTP Plugin from 1.6 to 1.9, a transfer set I had which was to transfer all *.json files from a folder in my workspace called "generated" stopped working, instead all files from my root workspace folder were uploaded instead (not including subdirectories)

WORKAROUND: downgraded to FTP Plugin 1.6, desired transfer set resumed working