Vuetify - Why v-menu with open-on-hover is closing when mouse is over a list of v-select or v-combobox components

Question

steps to reproduce:

1 - place a v-menu with open-on-hover property 2 - add a v-select or a v-combobox item to it..

when v-menu is opened, and the lists from v-select or v-combobox are displayed, v-menu automatically closes if mouse hovers the list. (note, only when hovering the LIST that vcombobox or v-select opens)

Tried to prevent with event.stopPropagation(); and no success.