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:
Филолог заявил о массовой отмене обращения на «вы» с большой буквы09:36
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第一百条 违反治安管理行为人、被侵害人或者其他证人在异地的，公安机关可以委托异地公安机关代为询问，也可以通过公安机关的视频系统远程询问。
В Финляндии предупредили об опасном шаге ЕС против России09:28