(Disclaimer: This thread turns out to be more about the behavior of the [DEEP_SPECIAL] tag in the raws, rather than a bars Vs. wafers usage thread. My initial thinking that the problem was related to bars and wafers was incorrect. Just FYI for those reading)
So. Had an idea to add a couple of metals to my game. Just a personal mod, and small. The original intent was to make Candy heavier, add Mithril in as a direct replacement for the original Candy, then add an alloy of the two. Candy and Mithril are both treated as original Candy, in that they're wafers, can be used to make clothing, etc. They're also both treated as Deep Specials, so they spawn up on maps like original Candy does, way down deep, in spires.
I figured the alloy, which requires one wafer of each, one steel bar (for lack of a better idea at the moment), and a flux boulder, should itself be a bar when made, rather than a wafer. That was where I ran into an issue.
I guess civs just don't make or do anything with wafers, but if you have something that is a bar, even an alloy of the otherwise never produced Candy and new Mithril wafers, the civs will still produce it at the Mountain Homes. It caught me off guard I guess.
Example: The trading caravan never, ever, makes or brings Candy items, or Candy wafers, or Raw Candy (or Mithril too, in this case). That's normal. They just don't seem make them, bring them to you to trade, etc. Even though they have the permitted reaction, it's only the player that ever does that.
However, add in a reaction to use the above materials and make an alloy BAR as the result (no raw material mineral of it that spawns of course since it's an alloy), and apparently the Mountain Homes just go nuts. I guess the solution is to simply make the alloy a wafer also, I just thought it more appropriate to make it a bar. I was also going to make a bar out of Candy, since it was becoming heavier in my mod, but then I assume I'd end up with the same problem.
I'd start seeing migrant hunters show up with Candy crossbows, just as they did with my new alloy, and the caravan bringing a ton of crafts, weapons, or anything that could be made of metal, made from the alloy and the new bar type Candy.
So, I guess the whole point of this post is to ask if there's any way to control that? I assume not. I just had figured since the Mountain Homes NEVER seem to make their own Candy, they would never have the reagents to make the alloy. Obviously the way the game abstracts the Mountain Homes out makes this untrue however, sigh. I wanted the alloy (and altered Candy bars), to be a rare thing of course, but obviously that wasn't the result.