 Prima facie, a dynamical collapse theory of this type can be a quantum state monist theory, one on which, in Bell’s words, “the wave function is everything”. In recent years, this has been disputed; it has been argued that collapse theories require “primitive ontology” in addition to the quantum state. See Allori et al. (2008), Allori (2013), and also the entry on  collapse theories,  and references therein. Reservations about this approach have been expressed by Egg (2017, 2021), Myrvold (2018), and Wallace  (2020).