Exceptions prove rules.
I have seen many a competent guitarist all at sea picking up my bass for a play. They would probably be fine if they had one at home and practiced on it but that's not who we are talking about.
Story time.
One New Year's Eve I was in the audience when it all turned to custard. I surveyed the scene on stage. Bassist had vanished and LG was now 'playing bass'. I volunteered and LG was relieved.
I guess they were figuring it couldn't get any worse with the random sober guy volunteering and if it did the sight of some random playing his gear might spur their man to get back from his girlfriend meltdown problem.
We tore it up and I never saw the bassman again.
So you never listen to the radio?
Naysayers can eat my shorts. I don't 'pedal' as such these days but still have twin preamps for just the right amount of wild hair when I dig in and just the right amount of warmth when I don't.
Feed back comes from the body resonating and the strings playing ball. A magnetic pickup puts the measuring at the string instead of the body but you aren't doing anything about the source.
I'd be looking through everything for accidental 'low end boost'.
If I didn't find something obviously amiss I'd take it all outside to rule out something vibrating inside.
Bring it up gently. Maybe you got covid deafness or just forgot how loud one cab can go before it starts smashing itself to bits. BF is not immune to being blown up by too much power too low.
There's a far eastern possibly Buddhist lesson that goes something like
A scorpion is on a journey and comes to a river. There's a cow on the river bank so the scorpion sidles up and begs a ride across. The cow is a bit reluctant but agrees and transports the scorpion across. The scorpion stings the cow a lethal sting as he hops off. The cow plaintively enquires 'what the duck?'. Scorpion shrugs 'I am a scorpion, that's what we do'.
I would be resigned to the fact that it's all out of my hands and the dealer's hands until the wheels grind on at USPS.
I hope it is fully insured so the dealer isn't out of pocket when ordering up the replacement. If you ordered from the dealer he's on the hook to provide or refund you I reckon.
When I lived in the UK I had yet to set foot in Australia. ''Wot, you never been to Australia!??" ''Yeah, ever been to Russia?''. Same distance, not like popping over to Paris for lunch.
It's a very flimsy film so you wouldn't want it anyway. I once bought a near new Jazz that the original owner hadn't removed it. At first I was horrified that he had replaced the original scratchplate with a graphic guide loaded one! Off it came. Iirc the only thing holding it down was ''static suction'', or at least no adhesive to see.
My set lists have Extras at the bottom. Sometimes we play some, or all of them, depending on what happens. If we have taken a bow it's not often we will play more after that.
As an alternative to potential trip hazard or nipple ring tearing out I suggest the following amendment.
Get in the habit of saying ''I am putting down the bass, I don't want to Downunder my nipple, I mean run down my battery'' and unplug.