I use VLC (on an FP3 runnning /e/OS Android though), and during playback, I can pull down the notifications and see a miniature of what’s playing with an overlay including a play/pause button. Doesn’t this appear on your FP4?
Yeah, it works the same on my FP4. Every media app has a notification with controls. It’s also visible directly on the lock screen so you don’t even have to unlock the phone.
Same here on FP4 with stock FP OS: Any media player I used so far shows the lock screen notification. Maybe you disabled those notifications unintentionally or your lock screen settings are configured in such a way generally?
I use Nova launcher as well, so it’s not that. From your screenshot I also guess that you have lock screen notifications set to “all”.
Please have a look at Settings → Sound → Media → Media player in Quick Settings
It should work even when this options is disabled (as it does in my case) when any media app is running. The option just ensures that the notification stays there for a longer time period so you can easily resume playing even when the app is turned off.
I had similar issues with audible on my FP3 and found that notifications for the app were disabled. So even if you dont remeber to have changed something I would check notification settings for each APP, when overall notifications are allowed and are allowwd on the lockscreen