Kayn Ultimate Bug. Please Be Advised.

I will provide recording clip soon as possible to see it first hand. The Ultimate is said to make Kayn untargetable, however... this particular bug allows Kayn to be damaged by fiddlesticks W while mid ultimate. As stated, I will clip the recording to the time of occurrence and validate my findings to be true. In the meantime, to recreate the appropriate scenario to test this yourselves, take Fiddlesticks and Kayn and have fiddle use w, immediately following the first tick of the DoT use Kayn's Ultimate and check the data logs from beginning of ultimate til emergence following end of ultimate animation. I'm sure you will see my findings to be accurate and worth investigating further in coding. Thank you.