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a1b1b06b9e
In this commit, we aim to resolve an issue with nodes requesting for channel announcements when receiving a channel update for a channel they're not aware of. This can happen if a node is not caught up with the chain or if they receive updates for zombie channels. This would lead to a spam issue, as if a node is not caught up with the chain, every new update they receive is premature, causing them to manually request the backing channel announcement. Ideally, we should be able to detect this as a potential DoS vector and ban the node responsible, but for now we'll simply remove this functionality.