Log this:
import rerun as rr
rr.init("rerun_example_points3d_simple", spawn=True)
rr.set_time_sequence("aaa", 1)
rr.log("my/points1", rr.Points3D([[0, 0, 0], [1, 1, 1]]))
rr.set_time_sequence("bbb", 1)
rr.log("my/points1", rr.Points3D([[0, 0, 0], [1, 1, 1]], colors=0xffff00ff))
Then look at timeline aaa:

Why are my points using the color from timeline bbb?!
Log this:
Then look at timeline

aaa:Why are my points using the color from timeline
bbb?!