Await tx confirmation by watching nonce #1782
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What I did
Fix a long-standing bug (at least 3 years now) where transactions could sometimes fail with "tx dropped without known replacement" at the moment they confirm.
The shorter the blocktimes, the more likely you were to hit the bug. I'd always blamed it on poor load-balancing for L2/sidechain RPC infra but it turns out it was my fault 🤣