How to update Kindle Previewer render engine?

Hi,

I am kinda new to creating books for kindle, especially KFX format.

First, I am trying ti write an Arabic ebook with special font that has special font character for each number.

However, I am having and issue with how kindle previewer render these characters.

As you can see in this picture.
Lift side: Calibre Reader
Right side: Kindle Previewer 3
Attachment 207022


Strangely, I have encountered the same issue in the software I am using to edit this book.

Lift side: Sigil 1.9
Right side: Sigil 2.0
Attachment 207023

Does anyone know how can I fix this issue? Or force Kindle Previewer to use new renderer?

Attached Thumbnails