Let me reiterate what the OP means to say.
The problem is with the Code completion. There is an option "Add parentheses after function name auto completion" when checked, parentheses are automatically added to the function name. It worked in the past version of CB. But starting with 20.03 and all the nightly builds, it stops working.
For example, if I start typing "std:abs" ... the Code completion will give me a list of choices and after I choose (let say the first one), it will display in the editor "std::abs" (for the 20.03 ver)... but in the past, CB 17 and older... the display will be "std::abs()" ... Notice the parentheses...
Edit: This bug only happens under Windows... Linux working fine...