Hello, I'm having an issue with custom helpers. My helper is getting the name of the key unresolved, instead of the value as expected when using a certain key style.

My helper is simple:

HandleBars.registerHelper('truncate', (context, arg1) => {
    if (!context) {
        return `INVALID_HANDLEBARS_PLACEHOLDER`;
    }
    let val = context.substring(0, arg1);
    return new HandleBars.SafeString(val);
});

I use this like this (and it works):

sample with MD5 hash {{{md5}}} ({{{truncate md5 6}}}...)

This however fails and just gives me the key (File.md5). So the truncation of the value fails and returns File.m instead of the shortened hash.

{{{"Characteristics.original filename"}}} ({{{truncate "File.md5" 6}}})

My json for the second is valid, and does render just fine without the truncate helper being used. I'm also not sure why quotes are required but I had to do this to get it to work:

Renders as: