Cura 5.3.1 not adding .gcode extension to save file? (Linux)

[Paul-UK 0]

I am not sure how this started but today I noticed that after slicing and choosing 'save to disk' even though 'g-code file' is selected the created file does not have the .gcode extension added.

I have added some extensions but none were related to saving. I can not find a setting for Cura or the printer.

Is there a setting to change or a config file to edit?

[miahotrod 1]

I am experiencing same issue Running Linux Mint 21 and Cura 5.3.1 

I tried add the extension but the print would start off bed and Jam not sure if its related.