[Bug Report][3.7.7] VList with nav prop: VListItem spacing issue when only child

[antoinematyja]

Environment

Vuetify Version: 3.7.7
Vue Version: 3.5.13
Browsers: Safari 18.1.1
OS: Mac OS 10.15.7

Steps to reproduce

Create a VList with the nav prop, add a subgroup with only 1 child, and another item after
The subgroup item and the next item will not have a gap when all others items have one

To reproduce with the reproduction link, open the "Users" top item, then the "Admin" sub item
The sub-sub item "Management" has no margin-bottom and is sticking to the next item "Actions" (you need to hover the items to see it), when all items should have a 4px gap

Expected Behavior

4px gap between all list items

Actual Behavior

List group with only 1 child do not have correct spacing after

Reproduction Link

https://play.vuetifyjs.com/#...

Other comments

The issue comes from this code:

vuetify/packages/vuetify/src/components/VList/VListItem.sass

Line 277 in 5ca8184

&:not(:only-child)

It can be fixed by removing the :not(:only-child) from the selector, however I guess this was added here for a reason