Canonical tags are not applied after 3rd category level when having a category tree with more than 3 levels (department, category and subcategory), the other above levels aren't displayed in canonical. The only exception is when the routes are stored in rewriter.

1. Create any 4th level subcategory
2. Access the page created
3. Check the Canonical for it on the console, it will not show anything after the 3rd level. Only 3rd and bellow.

Run the bootstrap query on rewriter vtex.routes-bootstrap@0.x:

{bootstrap{categories}}