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- PR https://github.com/sigp/lighthouse/pull/8045 introduced a regression of how lookup sync interacts with the da_checker. Now in unstable block import from the HTTP API also insert the block in the da_checker while the block is being execution verified. If lookup sync finds the block in the da_checker in `NotValidated` state it expects a `GossipBlockProcessResult` message sometime later. That message is only sent after block import in gossip. I confirmed in our node's logs for 4/4 cases of stuck lookups are caused by this sequence of events: - Receive block through API, insert into da_checker in fn process_block in put_pre_execution_block - Create lookup and leave in AwaitingDownload(block in processing cache) state - Block from HTTP API finishes importing - Lookup is left stuck Closes https://github.com/sigp/lighthouse/issues/8104 - https://github.com/sigp/lighthouse/pull/8110 was my initial solution attempt but we can't send the `GossipBlockProcessResult` event from the `http_api` crate without adding new channels, which seems messy. For a given node it's rare that a lookup is created at the same time that a block is being published. This PR solves https://github.com/sigp/lighthouse/issues/8104 by allowing lookup sync to import the block twice in that case. Co-Authored-By: dapplion <35266934+dapplion@users.noreply.github.com>