Questions about sim group

[feylor]

After setting the particle group, I then set the BIND regulation for the particles according to the group. However, when I have three groups, group 1 and group 2BIND group 2 and group 3BIND. However, unlike the previous version, all the particles will collide when solving. So what is the correct setting for the new version? If it is convenient for you, could you please write a more detailed explanation? Thank you. I did see the update log for the new version, and I saw that you made new adjustments here, but such adjustments confused BIND, which USES groups to control particles.