diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 773261d8d..83bbcadf2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -77,7 +77,7 @@ jobs:
     - uses: codecov/codecov-action@671740ac38dd9b0130fbe1cec585b89eea48d3de # v5.5.2
       if: (runner.os == 'Linux' && matrix.python-version == '3.12' && matrix.os == 'ubuntu-24.04')
       with:
-        fail_ci_if_error: true
+        fail_ci_if_error: false
         token: ${{ secrets.CODECOV_TOKEN }}
 
     - name: Cleanup codecov dirty state files
diff --git a/freqtrade/data/converter/converter.py b/freqtrade/data/converter/converter.py
index 99301d291..aa1c9cd52 100644
--- a/freqtrade/data/converter/converter.py
+++ b/freqtrade/data/converter/converter.py
@@ -111,12 +111,13 @@ def ohlcv_fill_up_missing_data(dataframe: DataFrame, timeframe: str, pair: str)
     # Forwardfill close for missing columns
     df["close"] = df["close"].ffill()
     # Use close for "open, high, low"
-    df.loc[:, ["open", "high", "low"]] = df[["open", "high", "low"]].fillna(
+    df.fillna(
         value={
             "open": df["close"],
             "high": df["close"],
             "low": df["close"],
-        }
+        },
+        inplace=True,
     )
     df.reset_index(inplace=True)
     len_before = len(dataframe)