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Related to #6880, an issue that's usually observed on local devnets with small number of nodes. When testing range sync, I usually shutdown a node for some period of time and restart it again. However, if it's within `SYNC_TOLERANCE_EPOCHS` (8), Lighthouse would consider the node as synced, and if it may attempt to produce a block if requested by a validator - on a local devnet, nodes frequently produce blocks - when this happens, the node ends up producing a block that would revert finality and would get disconnected from peers immediately. NOTE: This is PR#7030 cherry-picked from `unstable` to `release-v7.0.0`. Run Lighthouse BN with this flag to override: ``` --sync-tolerance--epoch 0 ```