Fix wrong custody column count for lookup blocks (#7281)

Fixes
- https://github.com/sigp/lighthouse/issues/7278


  Don't assume 0 columns for `RpcBlockInner::Block`

beacon_node/http_api/src/publish_blocks.rs

@@ -2,7 +2,7 @@ use crate::metrics;
 use std::future::Future;
 
 use beacon_chain::blob_verification::{GossipBlobError, GossipVerifiedBlob};
-use beacon_chain::block_verification_types::AsBlock;
+use beacon_chain::block_verification_types::{AsBlock, RpcBlock};
 use beacon_chain::data_column_verification::{GossipDataColumnError, GossipVerifiedDataColumn};
 use beacon_chain::validator_monitor::{get_block_delay_ms, timestamp_now};
 use beacon_chain::{
@@ -302,7 +302,11 @@ pub async fn publish_block<T: BeaconChainTypes, B: IntoGossipVerifiedBlock<T>>(
             );
             let import_result = Box::pin(chain.process_block(
                 block_root,
-                block.clone(),
+                RpcBlock::new_without_blobs(
+                    Some(block_root),
+                    block.clone(),
+                    network_globals.custody_columns_count() as usize,
+                ),
                 NotifyExecutionLayer::Yes,
                 BlockImportSource::HttpApi,
                 publish_fn,