Act 5.2.4's Bug at Starlord's and Rocket Raccoon's fights or VtD's bug

TRONG94

I was exploring act 5.2.4 (global node: Masochism) and took Raccoon and Starlord path (local nodes: Combo Shield and Checkmate). At the beginning of fights, there was no problem. Then, at some random points, when I hit them, they received totally no damage (no number was displayed). Is it normal? Did I miss something?

Here is the fight agaisnt Starlord. My bleed debuffs on him were still registered and helped him regen 5%. But normal hits and special attacks showed no damage at all.
https://youtu.be/jDUgXCBqnZc
P/s: Or is it VtD's bug? I just noticed I could only deal damage to them when VtD had fury buff.

YoMoves

There's a similar issue I share on the PULL! lane in AQ.Voodoo vs. HtD is a weird interaction. My L1 and poisons do the correctly scaled damage, but my melee attacks do no damage at all as opposed to the reduced amount.

hiddenblizzard

6* rank 1/25 vtd vs role black panther
Some hits deal absolutely no damage, I feel it's a Vtd bug