I have had the same issue when importing a module with wrong encoding.
I had to save the module to my pc, re-save it with a new encoding in vscode or notepad++ then load it to the controller again.
Do you have the same issue if you create a new module with robotstudio in the controller?
In that case i don’t think this fix will work.
As you say, usually it’s an issue where you can re-save the module with encodein “ANSI” in e.g. notepad.
But this time I’m connected to the real robot and open a “live” module in the Rapid memory.
However, I found the solution now:
In Windows:
Control Panel → Region → Tab “Administrative” → Change System locale → Uncheck the box “Beta: Use Unicode UTF-8 for worldwide language support”