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Rotate pages of pdf using merger api

Hello all I have a pdf with some pages in portrait and some in landscape, now I want to change the pages which is in landscape into portrait mode, I used groupdocs merger

OrientationOptions orientationOptions = new OrientationOptions(OrientationMode.Landscape, new int[] { 1 });
                using (Merger merger = new Merger(documentPath))

above is my code to rotate pdf page in portrait mode, I tried this code on 20.4 and 21.7 version of groupdocs merger but I am getting the error of

Requested ChangeOrientation operation for ‘Pdf’ document type is not supported on the below line



This issue is reproduced at our end. Hence, we’ve logged it in our internal issue tracking system with ID MERGERNET-1174. It’ll be now further investigated and you’ll be notified about the outcomes.