For those of you who don't read every post in the forum, Darkis did make reference to this issue in the now locked "Crickets" thread.
Again as I've stated, it's working as intended providing the 1% chance of Success. I'm more than happy to hear folks provide definitive proof of it not doing so.
I had a nice chat with some of the folks in Discord to get their understanding/thoughts on it all and it's pretty much what I figured, there's no proof that it isn't working.
So I went to the discord and these are the relevant portions of what Darkis said:
CC_Darkis - 03/07/2018 Last I had gotten back was the % boost or what not worked as intended. But with all the complaints and it being a point of contention on the forums ...I'll verify it
CC_Darkis - 03/07/2018 Hmm yeah looking into the data it's self it looks to be working
CC_Darkis - 03/07/2018 well it'll cap at 100% regardless but under that it looks like it's purely display not reflecting as it should
CC_Darkis - 03/07/2018 from what im seeing it's success multiplier
This last post would indicate to me that the furniture does increase fusion success and is applied as a scalar (e.g. 50% success goes to 50.5% [50% x 1.01]). That dramatically weakens the outcome and would make it more difficult for us to see
As a side note, the second to last post addresses discussion from the "folks in discord" who believed that the functionality impacts the distribution of fusion results (e.g. if you fuse different items and add the odds they are greater than 100%) and how that could be advantageous or disadvantageous.