Fix refresh_latest_ohlcv bug

freqtrade/exchange/exchange.py

@@ -1253,7 +1253,7 @@ class Exchange:
         logger.debug("Refreshing candle (OHLCV) data for %d pairs", len(pair_list))
 
         input_coroutines = []
-
+        cached_pairs = []
         # Gather coroutines to run
         for pair, timeframe in set(pair_list):
             if (((pair, timeframe) not in self._klines)
@@ -1265,6 +1265,7 @@ class Exchange:
                     "Using cached candle (OHLCV) data for pair %s, timeframe %s ...",
                     pair, timeframe
                 )
+                cached_pairs.append((pair, timeframe))
 
         results = asyncio.get_event_loop().run_until_complete(
             asyncio.gather(*input_coroutines, return_exceptions=True))
@@ -1287,6 +1288,10 @@ class Exchange:
             results_df[(pair, timeframe)] = ohlcv_df
             if cache:
                 self._klines[(pair, timeframe)] = ohlcv_df
+        # Return cached klines
+        for pair, timeframe in cached_pairs:
+            results_df[(pair, timeframe)] = self.klines((pair, timeframe), copy=False)
+
         return results_df
 
     def _now_is_time_to_refresh(self, pair: str, timeframe: str) -> bool:

freqtrade/plugins/pairlist/VolumePairList.py

@@ -115,7 +115,7 @@ class VolumePairList(IPairList):
         pairlist = self._pair_cache.get('pairlist')
         if pairlist:
             # Item found - no refresh necessary
-            return pairlist
+            return pairlist.copy()
         else:
             # Use fresh pairlist
             # Check if pair quote currency equals to the stake currency.