Plantsim question: is this supposed to happen?

Plantsims recently got a small update with the latest pack. I felt nostalgic and started to play with a new Plantsims because they were my favourite occult in the sims 2 days. Unfortunately in sims 4 they are more of a temporary ailment than a real lifestate.

My plantsims timer started to run out so I had her eat the plantsim fruit a few hours before the time expired... and nothing happened. Turns out I had to wait for the plantsim to wear of, so for her to loose her entire occult identity before the fruit takes effect. Is this what is supposed to happen? Instead of prolonging the plantsim we have to interrupt every five days and break the illusion?

I know there is one function in enchanted by nature to prolong the plant sim trait but that means gathering 20 fairydust every 5 days, which is far from ideal either. 

Before anyone suggests mods: I don't want to add in big overhauls. I always planned to do this when sims 4 is 'finished' with no more updates because we moved on to sims 5. but that doesn't seem to be anytime soon.