With all due respect to your venerable number of posts, and likely, your knowledge of the game, and hours played, etc etc. I mean that. No sarcasm or disrespect intended whatsoever in this entire post. I say that only because context, tone, etc are lost with text. i don't want to come off as a jerk.
The short of it (TL;DR as the kids these day say).
Unless you have tested the save and gotten the weapon to proc, and you can post screens of the weapon's sheet showing 1 or more out of 15, you don't know with 100% certainty that I'm wrong. Really, you can't even say that it's likely to be the case, educated or not, it's a guess, and to state the obvious, guessing isn't helpful. Testing is.
The long of it:
I think that you're trying to point out to me that I should be more patient, and/or play more before I come here and post about something that isn't a problem, taking up Obsidian's time and resources.. etc etc.. Is that it? I could easily have mistaken you, but that's how it came across to me. Otherwise, I'm honestly not sure why pointing out the 90% that is inherently there when someone says 10%, is helpful. I mean, thanks for the info I knew already, I'm sure you mean well. But it doesn't change the fact that I don't think it's working.
Beyond that, implying(or saying) that because it works for you, that it's likely working for me too, doesn't actually mean much from a programming or bug squashing standpoint. It could be a lot of things. It could be just my save, it could be only when bound to a druid, it could be the item itself is bugged in just my save and nowhere else in the world. It could be my hardware. Who knows? That's why Obsidian wants all the files they want when you make a post to the support forum with a potential bug. All of the reasons I just stated aren't as simple as the percent chance it has to happen(or not), and a comparison of your experience to mine. Additionally, if there is a problem, wouldn't you rather have it reported and then tested by as many people as possible to sort it out? In the end, the only way to know is to observe, report, and test. It's called a bottom up, scientific approach.
If you did test it, and know that I'm wrong, by all means, post a screen and say so. I will listen, congratulate you on a job well done, and walk away from this post knowing that I should just keep playing. That would actually save Obsidian time and resources, contribute to the forums in a meaningful way, and allow my OCD rear end to continue on with my game. Prove me wrong, please. I want to play my game!