Dust of Appearance

hi
i wanted to use the item dust of appearance, so i searched the ability of it.
what i wanted to do is to change the buff of the ability (description+name).
well it works if i directly change the original buff, but what i have to do is to copy the buff and give the new buff to the ability, but it still shows the old one.
i think its a bug, anyone know how to fix that?

Perhaps upload a test map?

theres no need to upload, just copy the dust buff and change for example the name, now give the ability the new buff. it doesnt work for me 0.o

most likely hardcoded as some other spells

basically some spells are made so that they accept only changes from original objects data
for instance avatar of mountain king displays the name of buff of the original buff, if you make a new one based on it it will ignore it