rigctld compatibility: compound commands

Janne Jan Ohlsson wrote here: https://forum.wfview.org/t/rigctld-compatibility/1715

I use the software Cqrlog that sends the command “fmv” to rigctld in a client server setup with wfview. This command is not answered, so I get no running updates of frequency in Cqrlog. However the command “f” is answered correctly with the rig frequency if I enter it as a telnet command (in my case “telnet 192.168.1.144 4532” followed by “f”). But a stacked command “fmv” does not work as a telnet command.

Wfview version is 1.2e, rigctdl version is 4.5.

Is this a compatibility issue between wfview and rigctld?