I´ve tested with “Material Design Icons” and “Google Material Icons”.
I’ve now added two icons separately and managed the visibility using the same formula:
$if(mi(vol)>0, if(tc(len, nc(aname,0)) >0, VISIBLE, REMOVE),“”)$
That works. So you can close this request, but the problem still remains for other users.
That doesn´t work. Normally, you have to use lowercase letters and a dash “-” between the words. That’s how it’s always worked so far. But even when I enter the original names of the icons into the formula, it doesn’t work.