This is not a common situation, but it happens that if a country signed the convention and the original driving licence complies with the required pattern (i.e. the country has adapted all the regulations, the document contains all the mandatory fields, a photo, etc.), you will be informed in the office that you do not have to take the theory exam in the WORD exam centre and your driving licence will be converted to Polish.
When you exchange your national driving into a Polish driving licence, your current document will not be returned to you.
The full list of countries of the Geneva and Vienna Conventions can be found on the website https://www.gov.pl/web/gov/uzyskaj-miedzynarodowe-prawo-jazdy