I work with secure pdfs at work quite often, and yes Edge randlomy try to open pdfs. Sending me to reset the pdf handler to an external app or force a download and then open app, point to file, open.

under my breath...another worklfow broken grumblegrumble and time added when I did not need it grumblegrumble, how do I force a change/automate, more time lost grumblegrumble