The mod/trainer will throw an error say there was a problem even though the change worked. You get the audio cue and the sidebar notification that the cheat did not work however the cheat did in fact work.
So far this happens for “900 skill points” “500 Chroma” “Lumina Point” and “Choose Shard”. I have not tested the rest.
it will say theres an error but it will still give you whatever you wanted. sometimes you have to refresh the inventory or menu by closing it down and opening it again.
add chroma to your inventory then go in to trader, leave traders menu and add more chroma. it has to update/refresh