What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it:
李 “나와 애들 추억묻은 애착인형 같은 집…돈 때문에 판 것 아냐”
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On Monday, the Gold Coast venue for the Shen Yun performances was forced to evacuate after a bomb threat, with a similar threat forcing the evacuation of Prime Minister Anthony Albanese’s official residence, The Lodge, in Canberra the next day.
Read the full story at The Verge.