CustomROM automatically hidden apps and I cannot unhide it.

Installed Matrixx (this happened in others too), installed some apps like fossify camera, and then, suddenly, system camera is not recognized in any app. It still exists, I can still use it, the default launcher still recognizes it, but for every other app is like it doesn't exist. Doesn't matter if I disable, hide, unhide, enable, restart... Nothing seems to work, even if I deleted their non-system equivalent. IDK what to do 😭