The time element is the key factor here.
8 AM Frankfurt time is the fakeout period meaning it has a high chance it will go in opposite direction to the move that happened 4-6 hours before it. Then comes london bar at 9AM frankfurt time or 8 AM london time that hour is the decider if the fakeout will last or continue.
Market doesn't care about hammers or bullish engulfing patterns, these candlestick patterns are just signs if there is buying/selling pressure or not.
You need to understand for every hammer that works there are many that don't. You should not treat any technical indicator or candlestick pattern as a holy grail. Trading is about being flexible and accepting the loss when things don't work out. I know this is easier said then done but if you cut the loss short you will stay in the game long enough to see a winner.