it failed but my move was still a basic attack.
still, it appears the combat move basic attack failed due to your attack being lower than opp defense.Read the effect of the move... my attack missed(Power Attack) but it was registered as "basic attack". Take some time and go read what the combat move does because it doesn't require me to explain anything to anyone that knows how the skill works but just for you heres a screenshot of the description. take your time...
some players use basic attack in combat set. also, block gives basic attack.
i have not notice this effect on my use of ice shards.
a picture may be worth a thousand words, but these needed explaining.
a single case seems more of a glitch than an ongoing problem.