Glaze Mortar container is not marked "This item can be used in tradeskills." even though it is used to create glazes which are used in creating other things.
It also means all the tradeskill components that are combined in a glaze mortar had their tradeskill tag removed. It also means the container will not open as a tradeskill container so you can't use favorited recipes. Which all means that the glaze mortar not being categorized as tradeskill is a pain in the butt. But it's kind of always been that way, aside from the item tradeskill tag removals.
Because it's not a tradeskill container. Never has been. It uses no tradeskill "skill" for the combine. This has been debated and argued about way too many times. Just go with it. Trust me.
