Hey there again,
We’re aware of a number of these issues (pre-2.2 shields not working as intended, either because of durability or not blocking HP damage; stun and block animations not syncing between attacker and defender; stamina not draining when in PVP combat; special attacks not draining stamina 50% of the time). The issue about shields sometimes getting bypassed could be related to any of the known above. We’ve sent it to the team so they can look into it and determine if that’s the case.