Similar issue for me as well. I have “{input_filename_base}_{print_time}.gcode” listed in my Filename Format textbox of the Others settings tab. The output filename when saving locally or uploading to CrealityCloud however ends up being a truncated input_filename_base then the filament type and the print time.
Expected filename for my input file “banana_stand.stl”: banana_stand_3h17m.gcode
Actual filename for saving/exporting: banana__PLA_3h17m.gcode
I even attempted adding quotes and escaping them and using some characters outside of the curly brackets to see what the effect was and nothing had any effect at all.