[crafting] Careful Synthesis Randomly Failing Last Step

I've noticed that Careful Synthesis, a skill that is currently billed as offering 90% Efficiency and 100% Success Rate, is mysteriously and randomly failing on the very last step of synthesis when the progress gained from using the skill will clearly complete the effort. I've noticed this behavior while grinding out recipes for Alchemy.

I can understand if there are external variables that might cause Careful Synthesis to fail (weather, etc.), but I have yet to see a tutorial window or disclaimer in the tooltip for the skill that suggest the 100% Success Rate can be otherwise diminished.

Requesting explanation or verification for this behavior.

Thank you for submitting your report about Careful Synthesis failing unexpectedly. We appreciate that you have taken time out of your day and away from playing FINAL FANTASY XIV: A Realm Reborn to let us know about this trouble so we can improve the experience of playing the game.

While we do appreciate that you have brought our attention to the trouble you experienced, the amount of information provided is insufficient for us to conduct an investigation into the cause of the trouble and how we can resolve it. To help provide some insight into the information we find valuable for looking into and resolving these errors, you can go to the Welcome to the "In-Game Bugs" Forum! (READ THIS FIRST) to find out what information we do need and why that information is important. There are also templates that we provide for reporting Windows errors and PS3 errors. We are certainly not going to require strict adherence to the templates, but they do help show the information we find important for those reports in an easy to fill out format. As long as the information is provided, however, feel free to use the format that feels most comfortable and informative to you.

We are looking forward to getting more information from you so we can look into this error and try to resolve it. Thank you for taking the time to provide more information about this error, and thank you for playing FINAL FANTASY XIV: A Realm Reborn.