Triple O'Nan conjecture for non-classical unitals

Let $q$ be a prime power and let ${\mathcal U}$ be a non-classical unital in ${\textup{PG}}(2,q^2)$. A Triple O'Nan configuration is a set of six distinct lines pairwise intersecting in exactly seven points of the unital and containing three distinct O'Nan configurations. Triple O'Nan conjecture. Every non-classical unital ${\mathcal U}$ in ${\textup{PG}}(2,q^2)$ contains a Triple O'Nan configuration if $q>5$. The paper proves the existence of such configurations for Buekenhout-Metz unitals of odd order, while the stated conjecture concerns all non-classical unitals in ${\textup{PG}}(2,q^2)$; the source gives no resolution status.