Yay, maybe I am not crazy!

Here is the other thread I reported this in, though there is no evidence anyone actually reads NA bug reports in that forum. There are four pages of threads without a single rep reply or acknowledgement. The only rep-related post is copy-pasta of a JP response, and it didn't fit into any created thread so they made a new one for it. I am not entirely sure why they would create and release the test server only to ignore all reported bugs, but it is what it is.

Assuming that nothing has been fixed since they were released on the test server, it might interest you to know Shijin Spiral and Shattersoul both have fixed additional effect durations (instead of varying with TP) as well. I don't feel like spending 20 merits to open them up though (and the test server is still broken), so you will have to try it on your own.