rpc: do not misidentify coinbase txes as pruned

src/rpc/core_rpc_server.cpp

@@ -1010,7 +1010,17 @@ namespace cryptonote
       CHECK_AND_ASSERT_MES(tx_hash == std::get<0>(tx), false, "mismatched tx hash");
       e.tx_hash = *txhi++;
       e.prunable_hash = epee::string_tools::pod_to_hex(std::get<2>(tx));
-      if (req.split || req.prune || std::get<3>(tx).empty())
+
+      // coinbase txes do not have signatures to prune, so they appear to be pruned if looking just at prunable data being empty
+      bool pruned = std::get<3>(tx).empty();
+      if (pruned)
+      {
+        cryptonote::transaction t;
+        if (cryptonote::parse_and_validate_tx_base_from_blob(std::get<1>(tx), t) && is_coinbase(t))
+          pruned = false;
+      }
+
+      if (req.split || req.prune || pruned)
       {
         // use splitted form with pruned and prunable (filled only when prune=false and the daemon has it), leaving as_hex as empty
         e.pruned_as_hex = string_tools::buff_to_hex_nodelimer(std::get<1>(tx));