I was thinking that this might had happened to you:
issues/5082#issuecomment-461428986BTW, the first post is the "
old version corruption bug" that you've been mentioning in the other thread.
What is described in the link is absolutely possible that this is actually what I did.
If so, is there anything at all that might help, or at least I could try besides file restoration
If it's what happened, you can only recover it from the deleted wallet files
because the address' private key might only be recoverable by restoring one of those wallet's seed phrase.
Since your current seed phrase restores an entirely different wallet, restored a couple of times with different configurations, both didn't help;
and if it's really the bug, then there's a chance that the addresses in your screenshot are actually addresses from a deleted/another wallet file brought by the bug.
Lastly, Electrum developers and public server owners don't have access to users' keys and funds, they wont be able to help even if they want to.