Set initialised_block if we called initialise_block (#1767)

substrate/Cargo.lock

@@ -1,3 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
 [[package]]
 name = "MacTypes-sys"
 version = "2.1.0"

substrate/core/client/src/call_executor.rs

@@ -237,6 +237,11 @@ where
 			native_call,
 		).map(|(result, _, _)| result)?;
 
+		// If the method is `initialise_block` we need to set the `initialised_block`
+		if method == "Core_initialise_block" {
+			*initialised_block = Some(*at);
+		}
+
 		self.backend.destroy_state(state)?;
 		Ok(result)
 	}