Could it be the address (1N8vh...) I copied is not, in fact, the address but the name of the wallet?
Unlikely. The default wallet is named
default_wallet, and that's not something you accidentally change into a Bitcoin address.
One possibility is
clipboard malware, although I haven't read about malware that replaces a bc1q-address with a legacy ("1") address. And if that's the case, I would have expected the funds to be moved by now.
If this is what happened I suppose this is a fatal error on my part and, given the security protocols, the bc can not be moved out of 1N8vh... since there is no such address owner.
It's unlikely you create an address by just typing it (I think there's about a 1 in 4 billion chance to type a correct checksum), so it's much more likely the address was created from a private key.
Your "fatal error" is not checking your wallet after the first withdrawal. Checking block explorers isn't enough if the address doesn't belong to your wallet.
This is the top line of my wallet: Electrum 4.3.4 - 1N8vh... [standard]
I don't know if it matters but I did open an electrum wallet on my phone. It seems somewhat different than the PC version. I don't see the 1Nvh... number on there anywhere. I just recently opened this wallet when I discovered the problem I have. Haven't done anything with it except look at it. I don't think the two are connected in any way.
Regardless, is it your expert opinion the bc showing on the blockchain under 1N8vh... is "locked" there having no way to be moved to my wallet or anywhere else for that matter? (Is this the kind of thing "miners" look for?) It's really not that much money to go further down this rabbit hole any deeper.