Toolhead collision at top of print - v-core 300

I recently changed to the new Rat Rig toolhead and am getting everything dialed in. One strange thing is happening that I can't figure out.

I'm attempted to print a vase model at about 13cm tall. Everything works really well until the very top, at which point the toolhead collides with the print and knocks it over. This has happened a couple of times now.

I'm using the latest Prusa Slicer.

v-core 300, rat rig toolhead, orbiter 2.0, rapido 2 uhf.
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