When you talk about a dream, when you talk about losing money, when you try to recall a dream or when you lose money, if it is an understated attitude, it gives people a feeling of "that's it, it's no big deal".
This is precisely the symbolic meaning of the theme dream of "lost things": the dreamer ignores his own psychology, and the neglected content is the lost thing. So it depends on what is lost and find out the symbolic meaning of this thing.
Dreaming of losing things means that the dreamer ignores and ignores his inner understanding in real life.