This is akin to a full research paper about a bug report. It's utterly unsurprising that a program may harbor some unusual or unexpected behavior in extremely uncommon edge cases. To me, this anomalous behavior simply arises as a consequence of an edge case in how KataGo handles unusual rulesets; this can be easily patched (as is extremely common for game-playing engines in general), or (as other commenters have pointed out) by not artificially restricting KataGo's strength.