fix: problem in ohlcv_with_cache

freqtrade/exchange/exchange.py

@@ -2896,8 +2896,11 @@ class Exchange:
         }
         pairs_to_download = [p for p in pairs if p not in candles]
         if pairs_to_download:
-            candles = self.refresh_latest_ohlcv(pairs_to_download, since_ms=since_ms, cache=False)
-            for c, val in candles.items():
+            candles_new = self.refresh_latest_ohlcv(
+                pairs_to_download, since_ms=since_ms, cache=False
+            )
+            for c, val in candles_new.items():
+                candles[c] = val
                 self._expiring_candle_cache[(c[1], since_ms)][c] = val
         return candles