Thank you for the patch!
I have updated the plugin, but unfortunately the font still appears broken :(
I am using the same file that I linked without any modifications. Maybe I'm doing something wrong? :0

Sure! ^^
https://drive.google.com/file/d/1QeMCetvUaWkaMbG4jG4TbtDhnUs76E-i/view?usp=drive...
This is the font I'm using. You can find it here: https://ninjikin.itch.io/font-hero-speak
Regarding the number of characters, it has the same numbers of characters as the one included in your plugin, as I used that as a template.