Skull hits on enemies with barrier sometimes get ignored on x4 game speed

Platform, device version and operating system:
PC, Steam client
Windows 7 (64-bit)
x4 game speed (might be the issue)

Screenshot or image:
None provided.

What were you expecting to happen, and what actually happened:
Normal gameplay operation, without any bugs or glitches.
Today, I was playing Stage 4, Battle 1 or 2, not sure, of the Orbweaver Class Event.
The one match with the Frost Giants - Hyndla Frostcrown and Skrymir the Lofty, etc.
Hyndla Frostcrown got moved up because of Skrymir the Lofty and got a barrier.
I took a skull match to remove the barrier, but the skull hit did not remove it.
On my next turn, then it was removed, however, it should have dealt skull damage instead.

How often does this happen? When did it begin happening?
I noticed it before, in the Arena and in Class Events, but not every time.
This bug is happening since 4.3, maybe even before that time.

Steps to make it happen again:

  • Play Class Events at x4 game speed.
  • Try to replicate the exact setup match (Stage 4, Battle 2 or 3? - Giants)
  • Skrymir the Lofty should barrier one unit and move it up, then take a skull match
    (if it won’t be removed - I am sure that it wasn’t reapplied, it’s a bug)