My bad. But were U already been blocking when Big Band hit U with Cymbal Clash / Parasite weave hit U or were U about to make block input it order to defend from Cymbal Clash / Parasite Weave hits?
BTW - what device are U using?
Fought against Big Band with Cymbal Clash / Parasite Weave many times with different characters and blocking hits did not apply STUN debuff to me.
[UPDATE]: Okay, I managed to redo it. It really occurs only if the blocking character has UNFLINCHING buff, kek.