Category Home + Features = bug

[MrSoulPC915]

I've been having a hard time since this morning with what I thought was the problem with a theme or module (which installs itself with this theme), when it's a bug in the native version of Prestashop, a big waste of time.

Prestashop 1.7.6.1, fresh install, default theme but visible with any theme.

To make the bug appear:

You must have one or more feature added to a product.
That the product in question is in the Home category.
Then click on the site map ( https://domain.tld/fr/sitemap), then on the Home category (or https://domain.tld/fr/2-accueil).

et voilà, an error "ContextErrorException - Notice: Undefined index: featureValues"