Audio occlusion does not work with imported sounds

[ko4t53e6]

Great plugin, but I can't get audio occlusion to work with an imported soundwave. Occlusion is working fine for me with a normal soundwave, but not with an imported soundwave.

CheckOcclusion() in ActiveSound.cpp is running on the tick as expected, but the necessary AsyncLineTraceByChannel is no longer called after the first few frames of play, where as with a normal soundwave it gets called each frame.