Latin Extended fonts

I use Google fonts (Poppins) on my website. It was working fine for a few months, but today certain characters (č) do not render correctly anymore. In the old versions of the theme, there was a setting to turn on Latin Extended support but now I cannot find it anywhere. I am thinking it might something to do with the theme update and some old settings could have gotten overwritten? Any suggestion how to fix this?

Solved the problem. There was something wrong with the text. It seems some characters were in other encoding but appeared normal in Word document and in WordPress until checking the HTML code.