I casually noticed that this workaround is not working any longer. Despite I have my LaF class taking the topLevelComponent, the behavior on Logic is not the same as before: magenta overlay on transparencies and menus going out the plugin boundaries.
EDIT: I tested a plugin built with 6.0.8 and it works as expected on Logic Pro X. New plugins and updates I’m building with 6.1.5 (so no changes made on the LaF), are showing the issue. I need to figure out what changed in between and why Component* getParentComponentForMenuOptions (const PopupMenu::Options&) override won’t get called.