Reproducer for ffizer problem with none-escaped brackets

.ffizer.yaml

variables:
  - name: foo
    default_value: myfoo

bar.ffizer.hbs

created: 20191128223719980
modified: 20191128223730628
title: /site/i18n/en-GB/welcome
type: text/vnd.tiddlywiki

{{$:/plugins/{{foo}}/{{foo}}/readme}}

! About this demo

*
*

! Known limitations of the {{foo}} plugin

*
*