Disabling Ubuntu Ctrl+Alt+delete still reboots the system if key command is given multiple times within a short time

I have disabled ctrl+alt+DEL key command using sudo systemctl mask ctrl-alt-del.target and sudo systemctl daemon-reload.

But even after this, the system reboots if I give the ctrl+alt+DEL key command continuously.

Is this a know issue with Ubuntu or if this is the expected behavior?

PS: I'm using only the cli interface via SSH. So answers based on GUI don't help.