Pathfinder unchained rogue skill unlock "knowledge" doesnt appear on output


Tengu
 

Hi all,
when adding a Pathfinder unchained rogue skill unlock for say "perception" all works fine.
When I chose "knowledge" though I can chose it and it appears in the GUI as entry but nothing appears in the output preview or the actual output. Neither the 5 ranks nor the 10 ranks items.
Any idea why?

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