The standardness conjecture for $(b;b-1,c_2,c_3)$-bridge trisections

Let $\mathcal{K}$ be a knotted surface in $S^4$ admitting a $(b;b-1,c_2,c_3)$--bridge trisection. Such a bridge trisection is a surface of the indicated type, with $b$ the bridge parameter and $c_2,c_3$ the remaining parameters. Standardness conjecture. Every $(b;b-1,c_2,c_3)$--surface is an unlink of unknotted 2--spheres and at most one unknotted projective plane. The conjecture is motivated by the fact that the associated branched double-cover trisection is standard; the source presents the corresponding conclusion as reasonable to conjecture, without stating a resolution.