Consistency in dash abilities (Bladesurge)

Watching this video https://www.youtube.com/watch?v=Lcg94TWk9oc I noticed something really random happening: even without reaching the target, some dash abilities will deal damage and other VERY similar abilities will not. For example, Bladesurge dealt damage without touching the target, Audacious Charge did not (although it played the animation, it is not clear the target was slowed). Even more randomly, Vault will apply the Harrier passive but won't deal damage.

Everything I ask for is consistency, Bladesurge and Audacious Charge are almost the same skill yet behave extremely different in this particular case (this is not about Azir's ult, any other displacement would probably reproduce it).