W3D Animation jumps back one frame when switching states

[xezon]

Reproducible on USA Warfactory Crane. Produce unit, cancel unit, crane animation will jump back one frame.

Potentially related to MAINTAIN_FRAME_ACROSS_STATES flag. Using MAINTAIN_FRAME_ACROSS_STATES2 makes no difference.

generals.2022-10-17.18-50-45-61.mp4

[commy2]

This is an off by one error I suppose. The frameno is actually maintained between frames, but it should instead advance by one. Ideally, it would increment by 1, unless the AnimMode of the previous state was ONCE_BACKWARDS or LOOP_BACKWARDS, in which case it should decrement by 1 instead, or if it was MANUAL, in which case the current behavior should remain (no advance of frameno).