Some more astute doctors, who were aware of the state of the science and that masks in general are unsanitary items if worn for more than a few minutes, wouldn't wear them at all during surgery since they seem to increase the risk of surgical wounds becoming infected.
all the studies on this page are pre-pandemic:
https://12160.info/m/blogpost?id=2649739:BlogPost:2035264
Some more astute doctors, who were aware of the state of the science and that masks in general are unsanitary items if worn for more than a few minutes, wouldn't wear them at all during surgery since they seem to increase the risk of surgical wounds becoming infected.