[g2.2pre-1572-gb90173e] Bug: Split sprites at the edges of a wall portal aren't removed

[ZZYZX]

Subj. Easiest way to reproduce is firing a rocket at portal's edge. When rocket explosion finishes, the rocket itself is deleted, but the split sprite remains and looks like last frame of explosion except oddly clipped.
http://i.imgur.com/WpcjExo.png

[Graf Zahl]

I cannot reproduce this. Both subsprites vanish as they should.