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Summary
When a 2.1 (i.e. no txsync) client connects to a 3.0 relay (i.e. txsync), the relay needs to request the client to keep sending it a TX messages - otherwise, these transactions would not get propagated.
The 2.1 and 3.0 above are network protocol versions, not a algod release version.
Test Plan
e2e test added.