rigctld -P -p ptt settings not working correctly.

[mdblack98]

From my understanding of the rigctld command line, I expected this command to accomplish the task:
rigctld -m 1043 -r /dev/ttyUSB0 -s 38400 -p /dev/ttyUSB1 -P RTS

The remote end connects with:
rigctl -m 2 -r xxxxxxx.local

I can read the frequency, etc. but trying to assert the PTT causes it to timeout and crash. After enabling debug info the remote side reports:

2021-06-18:20:15:49.155969: rigctl_parse.c(2394):rigctl_set_ptt entered
2021-06-18:20:15:49.155994: rig.c(2719):rig_set_ptt entered
2021-06-18:20:15:49.156016: rig_set_ptt: PTT RTS debug#1
2021-06-18:20:15:49.156050: ser_open called
2021-06-18:20:15:49.156078: serial.c(709):ser_open return(-1)
2021-06-18:20:15:49.156099: rig_set_ptt: cannot open PTT device ""
2021-06-18:20:15:49.156119: rig.c(2898):rig_set_ptt return(-6)
2021-06-18:20:15:49.156141: rigctl_parse.c(2432):rigctl_set_ptt return(-6)

Tracked down to this commit e0a3f8d