(EmberGen) Looping simulation motion vectors are messed up on first frame when generating a flipbook

I was playing with the 055_smooth_loop sample and seem to have found a bug: when I adjust its output to put motion vectors in two channels of the flipbook, the first frame is messed up.

Anyone else seen this? I’m on EmberGen, running Windows 10 (2004) with an RTX 2080.

I haven’t seen this issue before, but we’ll check it out!