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This PR fixes two issues: 1. This condition is inverted:dfb259171a/beacon_node/network/src/network_beacon_processor/gossip_methods.rs (L1507-L1508)We are supposed to filter out incomplete columns when we DON'T have local blobs yet! 2. When the EL returns no blobs, we never store a partial in the assembler, and this code fails to publish our need to the network, as no partials are returned:dfb259171a/beacon_node/network/src/network_beacon_processor/mod.rs (L1038-L1050)The simple fix for 1 would be to invert the condition, but we can improve the flow here: Instead of not publishing anything, we can publish what we got, but not request anything. This ties into the fix for 2: After get blobs completes, we not only publish anything in the partial assembler, but also for every missing custody column in there, publish an empty column and a request for all cells. In particular: - When sending a partial message to `network`, allow specifying a request bitmap instead of hardcoding an all-ones bitmap. - For clarity and to prepare for Gloas integration, add a `PubsubPartialMessage` enum with a `DataColumnFulu` variant. - On republishing after merging a gossip column: always publish, but only request cells if local blobs are known or get blobs is disabled. This also prepares us to request only *some* cells, e.g. in cases where we are aware of the blobs that the EL is going to send us, e.g. via `engine_hasBlobs`. - Move guards in `fetch_engine_blobs_and_publish` to ensure everything works fine if there are no blobs or if get_blobs is disabled. Co-Authored-By: Daniel Knopik <daniel@dknopik.de>