This happened to me primarily in Blazeridge Steppes. The guardian’s third auto-attack skill, Sword Wave, completely whiffs on environmental objects (i.e. Ogre Supplies, Inquest Lab Table, etc.) for no apparent reason. The attack just goes clean through the object and deals no damage and does not register as a hit. I just sit there doing Sword Wave 2-3 times in a row until the chain resets. I’ve tried moving around a bit and repositioning, changing elevation, etc. but it doesn’t seem to help.