This happened to me on the latest patch (Never tried levitate on previous patches): Tried for the first time yesterday the levitate spell since there's always been that one chest in the magical library teasing me that I can not jump to, so this time I picked levitate as a level up spell for my wizard. Much to my surprise, when I cast levitate on a companion, he just got shot up into the air and got stuck there, couldn't move anywhere. After a while I noticed I could pick the height of my companion as an action on my wizard, and after some fiddling with it, I managed to land him on the ground and he could move around. First of all, the levitate spell *seems* (I'm not a D&D ruleset expert) like my character should be able to *levitate* over chasms but alas, he always says that no path is available. After trying to find the places I could reach with the levitation, I managed to break the movement again and he just got stuck in place not able to go anywhere.
I also managed to make it so that he did move, but took like 5 seconds to move between each square on the grid which was really weird.