Rule number one for infections: infections make the beer taste odd, look odd or cause gushers. Yeast can grow in the formations you mention. My current BRR is did the same thing, but when I crash cooled, the strings dropped out.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk