Qml plugins not being linked when trying to compile Kdenlive on Ubuntu

Hi,
When trying to compile Kdenlive on Ubuntu 26.04, cmake gives a lot of warnings like

The qml plugin 'qtquickcontrols2universalstyleimplplugin' is a dependency
  of 'kdenlive', but the link target it defines
  (Qt6::qtquickcontrols2universalstyleimplplugin) does not exist in the
  current scope.  The plugin will not be linked.

As it’s just a warning, the application gets compiled but it’s not really functional.
It seems other projects have similar issues.

Any hint much appreciated.
Thanks,
Camille