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:
KP Snacks is proposing to close its manufacturing site for Tyrrells in Staffordshire, due to plans to discontinue its vegetable crisps.
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The SpaceX 'Starship' rocket takes off from the company's Starbase facility in Texas