Greek character in Deluxe script

Greek character in Deluxe script

Hi,

We have been using a script since 2022 which replaces characters in Greek contact names using replaceAll. 
Since this morning, all the Greek characters used in the script have turned to question marks. 
I tried retyping the characters, copy-pasting etc., but when I save the script everything turns to question marks again. 
I saw a new Deluge version was released today, did it introduce a bug? Is there even a temporary work-around?