I'm using Cinema4d R25.115, Corona version is daily build 8 (02-02-2022).
The passes are not shown in the VFB but they're saved as output files. It doesn't matter which kind of pass I'm using (masks, normals, lightmix etc.), the VFB stops at 16.
Tbh is not an issue if pass are saved but it still is a problem if you wanna check them while rendering.