I created chocolate from a mixer but as my basin still have milk, I have to filter to import only chocolate.
But when I filter on chocolate liquid nothing is imported (works without filter)
I tried with a lot of different pipes with filters (Refined Storage, Applied Energistics, Pipez...) but nothing is extracted.
Tried with Milk with blacklist but the result is the same.
Only works when no filter is applied....

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Same result with chocolate on whitelist

try using a powered pump from Create leading into your importer

Probably works (if you can filter on fluids) but there is no reason that this behaviour happens :)

use second basin, placed nearby as output

Thank you all for your answers but I just signal the bug. I found solutions in my modpack.
Though, I should not have to find it.

The reason it doesn't work the way you imagine is because Create basins don't auto export their contents, therefor a pump or spoutput is required to pull fluids out of them

Ok but when no filter is provided there is no problem...

are you sure you selected the Create milk fluid and not the vanilla milk fluid?

I selected vanilla Milk fluid because I insert vanilla milk fluid not Create one