Runtime2 animation jump at end

Playing the attached uip presentation (generated with srbench) when the cubes reach end of single 2s animation and should all be at left, black cube jumps into right side for a single frame. Console shows:
—
Failed to find root of cubic bezier at time 2 with coeffs: a = 0 b = 0 c = 1.13243 d = -1.13244
—

Note: Adjusting #Layer_1_Item2 position.x animation a bit e.g. "0.867565" -> "0.9" fixes this, so seems like rounding bug.