I could reproduce this, but am not sure if this is really intended.
My guess is that it’s intended (“why should I display something that’s set to false”) - but maybe the devs didn’t think about the option that someone would use booleans within customers and organisations.
@thorsteneckel could take a look if this is intended, but he’s on holiday.
As a workaround you could use a dropdown (select), this is working just fine and can contain a “key”.