I have no idea if that's normal for that species or not. It is an unusual species, so I doubt you'll get much response. I think you might do best by asking Brett.
About it being in Boon Mix...
You say you didn't touch the roots. If so, then what you have is afoot ball in nursery mix surrounded by Boon Mix. Boon Mix drains exceptionally fast. I don't know what soil the old rootball is. So what will happen when you water is the water will run right thru the Boon Zmix and out the bottom. Most likely, the old rootball isn't getting very wet.
You see, you have no roots in the boon mix. Roots won't grow out of the old rootball and into the Boon Mix on their own. Boon Mix is very open compared to most soil mixtures, and roots that are in tight rootball often won't move into the more open mix.
So, what you have to do to start using Boon Mix is a "half bare root" process. That is, bare root half the old root ball, and leave half untouched. This transitions the root system. Eventually, the half that gets bare rooted will find it really likes the Boon Mix, and will grow strong. Then, you bare root the other half.
The other thing you should do when potting is tease out 1/4 to 1/2 inch of feeder roots from the root ball. (Except the bottom. It should be flat, no roots extending down out if the rootball.). Make the sides fuzzy with feeder roots. Then use Boon mix and lightly chopstick it into place. The feeder roots should now have a start into the Boon Mix. Remember what I said how roots don't want to leave the old rootball to explore the new soil? Well, now they are in the new soil, so they'll start growing right on.
I bet if you pull the tree out of its soil, you'll find zero to very little roots growing out of the old soil into the new.
Boon mix is great stuff if used properly. But if used improperly, you may get poor results.
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