Remember, your weapon won't fire unless you pull the trigger.
I would say most people carry with a round chambered. Even without this issue you may not have time to rack the slide when you need your firearm. you may not even have two hands available. Always carry with one in the pipe, then you don't have to worry about chambering a round. If you need to reload, when empty your PM9 will be in slide lock, put in a fresh mag, hit the release and you're good to go.
personally when renting PM9s I've yet to run into this feed issue.