Manipulating spine bones with script

I’m testing the spine extension (Defold 1.9.6, spine extension 3.6.3) and keyframed animations with physics constraints are running fine but got stuck in this part https://defold.com/extension-spine/#the-bone-hierarchy .
I’m trying to transform spine bones programmatically but it doesn’t seem to work. Getting bone gameobjects with spine.get_go() seems to function (Create GO Bones is selected on spinemodel) but none of these - msg.post(), go.set(), go.set_position(), go.animate() - seems to have any effect for the spine bones. No errors, just nothing happens.
Perhaps I’m approaching this incorrectly, but I’m struggling to find any fresh information on this matter.

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