I am trying to add Oriya letters to my Monospace font. I am adding Below base form as marks attaching to the base glyph . I have also added the same below-base-forms for base characters for attachment of vowel marks, just like mkmk works for Latin. But shaper is refusing to attach to the vowel mark at the anchor position below the blwf. Is it not allowed to treat a mark as a base for indic  shaping? <img src=“https://us.v-cdn.net/5019405/uploads/editor/fg/lqg35z82kl1p.png” alt=“” title=“Image: https://us.v-cdn.net/5019405/uploads/editor/fg/lqg35z82kl1p.png” srcset=“https://us.v-cdn.net/cdn-cgi/image/quality=80, format=auto, fit=scale-down, height=300, width=300/5019405/uploads/editor/fg/lqg35z82kl1p.png 300w, https://us.v-cdn.net/cdn-cgi/image/quality=80, format=auto, fit=scale-down, heigh…