with your new join, the fields are searchable, this search works on my 
version:

l2_categories.name = "Jazz"

l1_categories.name = "Music"

Maybe fields need to be explicitly identified in grid command:

    grid = SQLFORM.grid(query, fields = [db.l1_categories.name, db.
l1_categories.id, db.l2_categories.name, db.l2_categories.id])

They don't have to be displayed, but have to be there in the background in 
order to sort, etc.

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