Do you have a savegame where this is reproducible (although this might be hard if the traits disappear)? And if you do, can you tell me *exactly* what mods you are running it with? (i.e. every mod you select in the launcher for that save)
...yeah, that would be a problem. The first part. Any save I make with any of those traits doesn't have them when I load it. As for the second, I'm running it with all the vanilla VIET components (Assets, Events, Immersion, Music, Traits) and VIET HKC, plus all DLCs except for Sunset Invasion.