Flush to infill or object does not reduce waste

I am doing a print with a lot of colour changes. I am using Orcaslicer and a Creality Hi. I tried using the flush to infill and flush to object options, but this does not reduce the amount of waste produced. I thought the waste would go to the infill and object? But the printer seems to use the whole flush volume on waste before even going to the prime tower. Is this a known issue?

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