Ui_dropdown no reaction to input payload if passing through

NODE-RED: v1.2.6 on Raspi Model 3B running Buster
ui_dashboard version: 2.26.1

Documentation says:
" Setting msg.payload will pre-select the value in the dropdown."

Nowehere can I find the fact that this only works if the user does NOT tick " If msg arrives on input, pass through to output". If that option is selected then all msg.payload input is ignored, making it impossible to reset the dropdown programtically.

Is this by design or is it a bug? What am I missing?

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