One reason for the this behavior could be if the dropdown values appear dynamically in the DOM tree once the dropdown is opened. If so, you will need to trigger the appearance of the dropdown and then locate the option you need to select. Basically the test should look similar to this:
1. Click on the dropdown (meaning the element which opens the dropdown).
for the option to select to exist in the DOM tree.
3. Click on the desired option.
Based on the DOM tree snippet I suspect you are automating an input with multi-select dropdown so you need to perform the above steps few times until all desired values are selected.
Additionally, another approach could be possible depending on what is nested under the div element with class="Select-input". If the listed select options are available under that div, then these are available in the DOM tree and you should be able to locate them using chained find expression
I hope the above helps. If you will need further assistance however, please consider providing a sample web application with the same control implemented, to demonstrate what the exact scenario is. This will help me investigate for concrete solutions on our side.