test: Fix intermittent issue in mempool_compatibility

Author: MarcoFalke

test/functional/mempool_compatibility.py

@@ -29,7 +29,7 @@ def skip_test_if_missing_module(self):
 
     def setup_network(self):
         self.add_nodes(self.num_nodes, versions=[
-            150200, # oldest version supported by the test framework
+            190100,  # oldest version with getmempoolinfo.loaded (used to avoid intermittent issues)
             None,
         ])
         self.start_nodes()
@@ -72,5 +72,6 @@ def run_test(self):
         assert old_tx_hash in old_node.getrawmempool()
         assert unbroadcasted_tx_hash in old_node.getrawmempool()
 
+
 if __name__ == "__main__":
     MempoolCompatibilityTest().main()