on -current dconf-editor doesn't build anymore with vala-0.50.4, but is OK with vala-0.50.3:
------------------------
../editor/bookmarks-list.vala:149.83-149.99: error: Argument 4: Cannot pass unowned ref argument to owned reference parameter
_create_bookmark_rows (bookmarks_variant, view_mode, ref main_list_store, ref main_list_box, ref bookmarks_hashtable);
^^^^^^^^^^^^^^^^^
../editor/bookmarks.vala:41.16-41.64: warning: [GtkChild] fields must be declared as `unowned'
[GtkChild] private BookmarksController bookmarks_controller;
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
../editor/bookmarks.vala:87.64-87.79: error: Argument 3: Cannot pass unowned ref argument to owned reference parameter
update_switch_label (ViewType.SEARCH, ViewType.FOLDER, ref switch_label); // init text with "Bookmark this Location"
^^^^^^^^^^^^^^^^
Compilation failed: 31 error(s), 89 warning(s)
ninja: build stopped: subcommand failed.
-------------------------

This commit/patch from gconf editor is adressing this problem. There was some problems around references of widgets which were bugs which happily didn't lead towards segfaults. But upstream decided to clarify all that :
https://gitlab.gnome.org/GNOME/dconf...4990de71db2b2b

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Solved in -current.