@hart
There are three ways to refer to columns:
{pulse.columnId}{item.columnId}{item's Column Name}
Clicking on corresponding column button in formula composer field should work, but it seems that when you close and reopen the window, the system updates all references with a hybrid (and not valid) {pulse.Column Name}.
General Caster has no control on integration window so it’s something monday.com devs and @dipro are investigating on.