201B 201F have zero width in Thin, Light, Ultra-Light

[Safari77]

for i in Thin Light Ultra-Light; do 
  pango-view -t "a‛u‟" --dpi=1000 --line-spacing=-1 --header --font="Montserrat ""${i}" --align=left --margin=32px -q -o Montserrat_"${i}".png
done
oxipng *png

201B;SINGLE HIGH-REVERSED-9 QUOTATION MARK;Pi;0;ON;;;;;N;SINGLE REVERSED COMMA QUOTATION MARK;;;;
201F;DOUBLE HIGH-REVERSED-9 QUOTATION MARK;Pi;0;ON;;;;;N;DOUBLE REVERSED COMMA QUOTATION MARK;;;;