Yeah, the swelling can disappear... swelling is caused by electrolyte decomposition (comes from use/abuse & age) which generate gasses inside the LiPo pouch, with heat those gasses will expand & in severe cases make the outside of the battery...
Hi there & welcome to the forum :D👋
Neither of the logs reveals anything suspicious, everything looks normal until the logs stop with the drone still airborne.
The battery voltage & overall behavior was normal
No abrupt unexpected or...
Both fw version 01.00.0800 & 01.00.0700 have the same ARB value (3) as 01.00.1000... so you should be able to roll back to either of them.
Use...
... & either try downloading the .0700 or .0800 directly in the Drone-Hacks app or use...
What's the problem with DJI's intended app for the Mavic Pro... DJI GO4?
Since several years now you don't find it on the regular app stores... you need to get it directly from the DJI site & sideload it to your screen device.
Get it here for...
Check out the user manual for the OP's Mini 2 at page 14... or maybe page 47 from a newer Mavic 3 Pro or page 44 from the Air 3S. Look up the chapter Low Battery RTH.
From what I've seen over the years, all Mini, Air & Mavic iterations have it...