T2 Class 29 details

I just got a call from CRA about a T2 I recently filed for a client. There was a disposal of the last asset in a Class 29 pool, and I set the field “Full disposition” to “Yes”. I assumed there would be no CCA taken, because there was a full disposition and the UCC was zero. But, TaxCycle calculated CCA of $38,472 and I filed it without realizing that. CRA caught it and called to ask about it. I believe the CCA should have been zero, and TaxCycle calculated it in error. But, maybe I am missing something? Something special about Class 29? Some other place I needed to tick a box?

Anybody else seen this, or have experience with Class 29 in particular?