RHEL 8 - agetty - modem dial up not seeing login prompt

I have been supporting a system on older version of RHEL. It reached end of life so the customer I support got a new box and installed RHEL 8 on it. I installed and configure the application...

However, we have 1 difference and I'm not sure if it's something I've missed in configuration or if it's a difference between agetty vs mgetty (which we used).

On the new box when a modem dials in, we connect and unless we hit enter we do not see anything on the screen. If we hit enter the login prompt appears and we're good.

CONNECT 19200 V42bis
(nothing until we hit enter)
Red Hat Enterprise Linux 8.0 (Ootpa)
Kernel 4.18. (...) on an x86_64

Web console: ...

servername login:

The older RHEL after the connect message the system information would appear and the login prompt. No enter was required. How can I get that to happen on the RHEL 8?

If we assume the login is there and enter the userid we will get a login prompt (see images). The problem is the devices calling in are waiting for a login: prompt to send their ID.

<img src="/sites/profiles/files/discussion/images/2019-12/image_1_new_nologin.png" width="403" height="124" alt="Login screen - no Login prompt - no enter key pressed " />
(No login prompt seen- if we assume it's there... OK or we need to hit enter to get login - problem instruments that call don't know to hit enter and are waiting for login: message)

/etc/systemd/system/serial-getty@ttyACM0.service points to agetty and the ExecStart does NOT have a -p parameter?

Help!?
Stephen

(Image below show original system where we get login prompt)
<img src="/sites/profiles/files/discussion/images/2019-12/image_3_old_nocr.png" width="582" height="352" alt="Old RHEL - we see a login" />