Do you have any idea if this is just a bug or something that will be fixed?
What is a bug and what needs to be fixed? Is it that Solid doesn't interact with physics?
If so, this is covered in the Manual, specifically:
[quote:3dltxcvf] Physics won't respond to objects with the Solid or Jumpthru behaviors. These behaviors are totally redundant when using Physics and have no effect. Instead, use the Immovable property.