Spreadsheet View cannot copy/paste Dropdown or Lookup field values?

Spreadsheet View cannot copy/paste Dropdown or Lookup field values?

It seems that the nice copy/paste feature of the Spreadsheet view (in this case copying from another record in the same sheet view) is not able to copy/paste values in Dropdown and Lookup fields?

I've tried in 2 different apps, both in Chrome and Firefox.  Dropdown fields (choices are defined in the form) and Lookup fields (choices from another form) don't copy/paste.

Is this a bug or instead a not-yet-supported feature?

Are there other field types that do not copy/paste?

thanks...