i got this ---
"ismine": false,
"iswatchonly": false,
"isscript": false,
"iswitness": false
}
Have you tried
-rescan as aleksej996 said?
Otherwise, it means that the address didn't belongs to the wallet, I think you know this.
The first paragraph from the OP strongly suggests that it is an old backup.
Most likely, you've unintentionally overwritten the most recent wallet.dat by an outdated backup during your copy-paste procedure.