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6b9904c1bf
* Fix node lookup on fork-tree after a warp-sync After a warp-sync, the error condition was triggered by the absence of the parent node of the first imported block. The previous lookup implementation was traversing the tree using a recursive **post-order** DFS, this technique doesn't trigger the issue. In the last iterative implementation we were using a BFS instead. * Added internal doc warning * Small optimization * Specify post-order DFS in the comment