a whole unicode range being converted but not shown properly

[Osmax-Br]

Hi , I've been using cairo font in english for a while , I tried converting the arabic part of the font into lvgl format but it failed
in unicode there are three main ranges : Arabic(0600-06FF) , Arabic Presentation Forms-A (FB50-FDFF) and Arabic Presentation Forms-B (FE70-FEFF)
the 2nd and 3rd range are working properly and without any errors , however the first range converts and I can see it in the .c file , but it is not shown on the screen (shows only squares when converted alone , when converted with the 2nd and 3rd ranges it shows U+FB51 for all letter of Arabic(0600-06FF)
I tried many many other fonts to make sure that this particular font isnt working , but the issue seems to appear with any font
one more thing , the built-in "LV_FONT_DEJAVU_16_PERSIAN_HEBREW" font in lvgl do work fine and shows the Arabic(0600-06FF) letters correctly

here is my lv_font_config : lv_font_conv --size 32 -o "C:\Users\ Br\Downloads\Cairo2\cairo.c" --font "C:\Users\ Br\Downloads\Cairo2\Cairo-Regular.ttf" --range 0x20-0x7f -r 0x600-0x6FF -r 0xFB50-0xFDFF -r 0xFE70-0xFEFF --format lvgl --bpp 1

and thank you in advance