The German Affinity Publisher 1.7.3.481 (Windows) behaves in a weird way for some placed PDFs. See the video:
Placing a 2-page PDF file (creating by Publisher itself) into a new document works well. By default, the first page is shown, which is nice (0:00-0:19).
Choosing the second page does not change the displayed page. The first page still shows, which is not so nice (0:19-0:27).
Changing the zoom level with the mouse scroll wheel to make the document smaller still displays the wrong page (0:27-0:34).
When changing the zoom level to more than 100% (my personal guess), suddenly the correct page 2 is displayed, and keeps being displayed until the zoom level is decreased again to below 100%, which makes the first page appear again (0:34-0:52).
Very strange. Unfortunately, I couldn't recreate this particular problem with any other PDF file, so the culprit is attached.
Andreas Weidner
PDFPageProblem.mp4
Test-Elektrotechnik.pdf