Hi Dmitry, If the user lists created either through the API or the UI have the same parameters, they should be populated in a similar manner. Since some of the user lists created in the UI are not populated as well, this doesn't look like it is specific to AdWords API. I suggest that you post your question in the AdWords community forum <https://www.en.advertisercommunity.com/t5/Google-AdWords/ct-p/Google_AdWords> as they are better equipped to answer this question.
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