Blade Vortex not affected by Shaper's Presence (1.650.143.925)

To clear some stuff up, I did some testing to confirm my assumptions about the way these effects interact and I'd like to share the results for anyone that's not clear on them. Testing was done on an unascended lvl 100 marauder, only stats spent on skilltree, gear rares with stats and shackles with a 23% quality curse on hit for the selfcurse test aswell as a 30% temp chains curse effect helmet. Timing was checked on a recorded video so I'll share the timestamps (not a video editor so I won't do fancy stuff with the raw video, you'll just have to believe me)

To establish a base assumption:
(Effects will be shown as xx.xx%, yy.yy* , where xx.xx% is the self effect slow multiplier and yy.yy* the resulting effect time multiplier)

Solstice Vigil: 33%, 1.49*
TempChains@41% curse effect: 40%, 1.67*
Both of the above: 73%, 3.76*

Testing was done on Blade Vortex, base duration 5sec and
Molten Shell with L14 less duration, base duration 5.4sec
Video timings are in minutes:seconds.milliseconds, keep in mind numbers will be slightly off due to rounding and video keyframes

1: BV with only Solstice Vigil
Above time slow stats would predict an effective duration of 5s * 1.49 = 7.45s
BV applies at 00:00.427
BV fades at 00:05.445
The resulting effective duration of 5.018s shows solstice vigil did not affect BVs duration

2: BV with Solstice Vigil and TempChains:
Above time slow stats would predict an effective duration of 5s * 3.76 = 18.8s
BV applies at 00:09.091
BV fades at 00:17.460
The resulting effective duration of 8.369s shows that solstice vigil did not affect BVs duration. However, the duration aligns with the prediction for being affected by TempChains (5s * 1.67 = 8,35s)

3: Molten Shell with Solstice Vigil and TempChains:
Above time slow stats would predict an effective duration of 5.4s * 3.76 = 20.3s
MS applies at 00:03.528
MS fades at 00:23.588
The resulting effective duration of 20.028s shows that Molten Shell was correctly affected by the stacked self-slow effects of Solstice Vigil and TempChains. I say "correctly" here because while this test only looked at Molten Shell for brevity's sake, this is how it works for every effect I've looked at so far (besides BV).

I hope the above tests were able to illuminate the interactions of Shaper's Presence and TempChains for everyone and illustrate why I think the issue with BV is either a bug or an unexplained exception to the mechanic.