Limber is not working reliably

There have been some discussions of Limber in the past, but not much on the current Forum. So: Limber is not working for me on the Goldblum challenge. I think it doesn't work in other Event quests at times, but it's harder to tell due to the shorter stun times.
However:
I have maxed limber (-48% duration)
Thor's S1 has a 3 second duration +100% =6 seconds total.
Depending on how Kabam have set up their coding, Limber should either either reduce the duration to 4.5 seconds (3 second +[100-48]%) or to 3 seconds (3 seconds + 100%)x52%.
It does neither of these things: it's still six seconds.
I don't have video screen recording as I'm using an old device; but it's very easy to count the difference between 3, 4.5 and 6 seconds; and when I got tagged by his Unblockable S1, Thor stunned me for 6 seconds. And then beat the tar out of me. Then I let it happen a couple more times, just to check. It happened repeatedly, with multiple champions.
Details:
4th quest of Goldblum challenge
Fighting Thor with Juggernaut, Vision AoU and Hulk
Using a Moto G, Android 5.1.
(Yes I know it's an old phone. I dropped my regular phone. Butterfingers.)
I'm sorry I can't provide video (maybe when my regular phone gets back from the shop), but I'd appreciate a review of this; as 5 Mastery points is a lot for a Mastery if it doesn't work as intended.
I'm sure Limber works for my opponents, as I see some very short stuns in the Arena. But I'm never quite convinced my attacking champs get the same benefit...
However:
I have maxed limber (-48% duration)
Thor's S1 has a 3 second duration +100% =6 seconds total.
Depending on how Kabam have set up their coding, Limber should either either reduce the duration to 4.5 seconds (3 second +[100-48]%) or to 3 seconds (3 seconds + 100%)x52%.
It does neither of these things: it's still six seconds.
I don't have video screen recording as I'm using an old device; but it's very easy to count the difference between 3, 4.5 and 6 seconds; and when I got tagged by his Unblockable S1, Thor stunned me for 6 seconds. And then beat the tar out of me. Then I let it happen a couple more times, just to check. It happened repeatedly, with multiple champions.
Details:
4th quest of Goldblum challenge
Fighting Thor with Juggernaut, Vision AoU and Hulk
Using a Moto G, Android 5.1.
(Yes I know it's an old phone. I dropped my regular phone. Butterfingers.)
I'm sorry I can't provide video (maybe when my regular phone gets back from the shop), but I'd appreciate a review of this; as 5 Mastery points is a lot for a Mastery if it doesn't work as intended.
I'm sure Limber works for my opponents, as I see some very short stuns in the Arena. But I'm never quite convinced my attacking champs get the same benefit...
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Comments
I posted this about assassin asking them to display it when it gets triggered. Never got any abswr from Kabam. Oh well. Maybe one day.