Further activites on this issue:
I tried sending 2 coins from my core wallet address to the newly imported address. Debug shows:
But, it still doesn’t show the first 998 coins that were transferred to this address when the private key was exclusively in the Social Wallet. Just to be sure the private key is the same, I checked it in the social wallet and the core wallet. They are identical. Yet, core wallet, fully synced, will not show the first 998 coins. They are on the blockchain.