@Lampwrecker2 close range sound issues especially from behind has been a weak point of Apex for seasons, you can find multiple threads here in the forums about this.
Jetpacks...haven't had such a case, but that would be bizzare. Currently the most exploited sound issue = Ash ult and silent portaling. That is very annoying and pretty much you can either be paranoid and preaim clear air all the time or just face the consequences when enemy team executes porting ideally = beam you for free.