The following ingredients are used in the pottery recipe to make Odylic Vial. There are a few anomolies that need corrected. Code: item stackable tradeskill flag High Quality Firing Sheet 1000 Yes Water Flask 1000 Yes Block of Clay 1000 Yes Medium Jar Sketch 1000 Yes Glaze Lacquer 1000 Yes Alabaster Beak 1000 Yes Ivory Stormrider Canine 100 Yes Liquefied Earth 1000 Yes Shattered Crystal 1000 Yes Emerald Colored Mephit Scales 1000 Yes Oil of a Frog No No Solidified Magma 1000 Yes Fiery Granite 1000 Yes
All of those combines use a glaze mortar, which is not a tradeskill container. So having non-tradeskill ingredients for this isn't a bug. I know the recipe states that it's pottery, but the combines aren't. Stupid, but not a bug based on the container type.
That's not even remotely what I said. What I said is that a glaze mortar is not considered a tradeskill container, does not have a tradeskill tag, and does not use an actual tradeskill on the combine (even though you can use it to make tradeskill items). Therefore, you can combine things that aren't marked as tradeskill items. That means you can combine things like Oil of a Frog in it even if it isn't marked as a tradeskill item. That's why I said it's stupid...it acts like a tradeskill combine when it actually isn't. There are a couple of other containers like this (jars) that you combine things in, but aren't marked as tradeskill related. So, going back to your original post, Oil of a Frog not being a tradeskill item is not a bug that needs to be corrected because it's not used in any tradeskill recipes. Just because you combine something in a container doesn't make it a tradeskill combine.
I sent a PM to Ngreth in August 2017 about this very ingredient and his response was "Thank You. Combine that are specifically for quests are often left out of the "tradeskill" settings. This is a quest combine (the container is a no-skill container)". So basically what Velisaris said.