Warden has longer unstoppable without unstoppable active?

[Zen_Azusa]

Ignore the voices, was in a VC with some friends playing other games
It isn't a visual bug because I was clearly not affected by the knockdown and the stats on the left side immediately went to red once my ult ended.

I tried to replicate it with Paradox 3 + Ult and Warden Ult + Veil Walker, but doesn't seem to be replicated

View attachment Unstoppable is Longer huh.mp4