No syncing txs after importpubkey/importprivkey

Hello!

After making import public key to node tx data not available and not syncing.

It works well on Bitcoin Core node, but here nothing.

I also tried use importaddress, but had similar problem. Importprivkey also not worked.

On testnet all works fine.

I've tried Bitcoin ABC Daemon version v0.18.5.0-unk and 0.18.2.0-unk with config:
```rpcuser=wallet
rpcpassword=*****
server=1
rest=1
rpcclienttimeout=30
rpcallowip=0.0.0.0/0
rpcallowip=::/0
txindex=1
```

I also tried use it with no `txindex` option, but this not solve problem.

Start by reproducing the report with importpubkey, importaddress, and importprivkey on mainnet and testnet, using the listed Bitcoin ABC versions and configurations. Compare transaction availability and syncing in both environments, including with and without txindex; done means imported-key transaction data syncs on mainnet as it does on testnet.

Written by the indexing model from the issue text.