  Gross, Mansour, and Tucker introduced the partial-duality polynomial of a
ribbon graph [Distributions, European J. Combin. 86, 1--20, 2020], the
generating function enumerating partial duals by the Euler genus. Chmutov and
Vignes-Tourneret wondered if this polynomial and its conjectured properties
would hold for general delta-matroids, which are combinatorial abstractions of
ribbon graphs. Yan and Jin contributed to this inquiry by identifying a subset
of delta-matroids-specifically, even normal binary ones-whose twist polynomials
are characterized by a singular term. Building upon this foundation, the
current paper expands the scope of the investigation to encompass even
non-binary delta-matroids, revealing that none of them have width-changing
twists.
