I think it is a licensing issue. SI have the right to use Juventus name and logo for the main team, but not for the Next Gen side. Normally in the game the junior team would "inherit" the senior side logo, so SI have added a separate generic graphic that will overwrite the Next Gen logo to not show the Juventus badge.
To nevertheless force the logopack small Juve logo to appear in the game, one must add this line into the small club logo config:
<record from="43457016" to="graphics/pictures/team/43457016/icon"/>
The same for Club Brugge's Club NXT squad:
<record from="2000022413" to="graphics/pictures/team/2000022413/icon"/>