Ligatures simply do not display on emacs 26.3, windows 10

Hi,

I've been trying to use the Fira Code with prettyfing as explained here, Fira Code was installed through Chocolatey and Fira code symbole was downloaded and added to my fonts on Windows.

So now in emacs I have this available (pardon my French).

Once I enter the outlined code in my .emacs though, once I type a symbol like >> or ==> (in fira mode), they simply disappear, I get a :

Error in post-command-hook (prettify-symbols--post-command-hook): (args-out-of-range 22 24)

and if I use only Fira Code Symbol, one can see this. So now the letters and fonts are not shown but the symbol are somewhat, how can I fix this ?

Thanks

Start by reproducing the reported setup in Emacs 26.3 on Windows 10 using the .emacs configuration and Fira Code Symbol font described in the issue. Inspect the prettify-symbols--post-command-hook error for the reported args-out-of-range failure; done means symbols such as >> and ==> render without disappearing or raising an error.