[Solved] Error in product's sons listing after 2.6.12 -> 2.9.9.3 upgrade

[SteP[IT]]

As in my previous post, i'm testing a site J 2.5.27 with vm 2.9.9.3, obtained by upgrading a J 2.5.27 + vm 2.6.12 working website
After that upgrade, product's sons list is missing inside a product view.
See attached pictures: sons are correcly listed in product listing view (pic 1), but are missing inside the father product view (pic 2).
Is this normal, or it's a bug?

[attachment cleanup by admin]

[MarioP]

You mean the child products? Did you check the 'prodotti figli' tab in the parent view? They should be there 

[jenkinhill]

There is now a separate Child Products tab.

[SteP[IT]]

Sorry for having bored you all, I didn't realize that.
Thank you for the fast support.