Processive concepts typically subject to this valency conversion

melt, freeze, wake up, plunge/sink, dry (up), go out [fire]; break, split, boil, open, close, change, turn, roll, gather, fill

Latin lacks labile verbs.
Many of these roots are basically transitive.
Consequently, Latin uses the passive and reflexive in “middle” function.

Haspelmath, Martin 2017, "Universals of causative and anticausative verb formation and the spontaneity scale." Lingua Posnaniensis.