unexpected character: '-' when I copy a expression from input screen

[mzdluo123]

when I use other functions,the input box is not intuitive,so i copy the expressions from main screen
I replace the '−' to the '-' , the issues can be solved, but it inconvenient.

[mzdluo123]

version:3.4.9
downloaded from Google Play

[axkr]

"a−3" // ToCharacterCode

Returns

{97,8722,51}

https://www.codetable.net/decimal/8722

[mzdluo123]

I think when I click "−" button in main screen, it should be entered a '-' , so I can copy the expression to other function screen.
The reason I copy it from main screen is input boxes in other screens can't make me check the expression very clearly

when I use “-” in main screen , it works well

https://en.wikipedia.org/wiki/Plus_and_minus_signs