Currently, the Ideographic property happens only have Han characters. Yet
customarily the term "Ideographic" is applied to more than just Han; it is
applied to hieroglyphs and cuneiform, among others.
A. Keep the current characters, and document that "Ideographic" is really a misnomer, perhaps even deprecate the property name in favor of something like Han_Ideographic, or
B. Add the characters that are commonly viewed as being Ideographic, including hieroglyphs and cuneiform.
After thinking it over, I'd lean more towards B, since it would accord more with usage of the term, and the narrow definition can still be produced by intersecting script=han with Ideographic.