I switched over to the default config file and get the same behavior.
jonsmirl@terra:/etc/default$ cat tftpd-hpa # /etc/default/tftpd-hpa
TFTP_USERNAME="tftp" TFTP_DIRECTORY="/var/lib/tftpboot" TFTP_ADDRESS="0.0.0.0:69" TFTP_OPTIONS="--secure" jonsmirl@terra:/etc/default$
I switched over to the default config file and get the same behavior.
jonsmirl@ terra:/ etc/default$ cat tftpd-hpa tftpd-hpa
# /etc/default/
TFTP_USERNAME= "tftp" "/var/lib/ tftpboot" "0.0.0. 0:69" "--secure" terra:/ etc/default$
TFTP_DIRECTORY=
TFTP_ADDRESS=
TFTP_OPTIONS=
jonsmirl@