From the beginning, I never had all the default plants in V5I.
I had to create in Vue a folder designing Vue own Plants folder !

Recently, Vue crashed really hard (after relaunch, it lost every manual folder of objects, plants… ), and I had to do the same manœuvre again. So I don't think it's related to a specific update.

This is something I already read a few times in forums.

Good point is : you're not alone to experience that !