Quite possible. My Husqvara snowblower and lawnmowers certainly run worse on 87 octane w/ 10% ethanol. They sputter and seem a tad weaker than they should be. But put in the higher octane gasoline and whola, they run smoothly.
Husqvarna only calls for 87 octane?
Both my Stihl 2-stroke chainsaw and Stihl 4-stroke yard multi-tool call for minimum 89 octane! Maybe your Husqvarna calls for 89 octane also! It will be in the Owner's Manual.