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@michaelsproul noticed this warning on a devnet-3 node
```
Oct 01 16:37:29.896 WARN Error when importing rpc custody columns error: ParentUnknown { parent_root: 0xe4cc85a2137b76eb083d7076255094a90f10caaec0afc8fd36807db742f6ff13 }, block_hash: 0x43ce63b2344990f5f4d8911b8f14e3d3b6b006edc35bbc833360e667df0edef7
```
We're also seeing similar `WARN` logs for blobs on our live nodes.
It's normal to get parent unknown in lookups and it's handled here
a134d43446/beacon_node/network/src/sync/block_lookups/mod.rs (L611-L619)
These shouldn't be a `WARN`, and we also log the same error in block lookups at `DEBUG` level here:
a134d43446/beacon_node/network/src/sync/block_lookups/mod.rs (L643-L648)
So i've removed these extra WARN logs.
I've also lower the level of an `ERROR` log when unable to serve data column root requests - it's unexpected, but is unlikely to impact the nodes performance, so I think we can downgrade this.
Co-Authored-By: Jimmy Chen <jchen.tc@gmail.com>