I have dumped the keys and imported the private key associated with the above address - no coins.
I've never tested importing a Bech32 private key into Bitcoin Core. I know this works in Electrum:
For P2WPKH addresses (Bech32, starting with 'bc1')This time we'll add
p2wpkh: in front of the private key.
For example
p2wpkh:5PrivateKey
This should generate the corresponding Bech32 address