# Description
The rigid body data properties root_com_vel_w, root_com_pos_w, and
root_com_ang_vel_w currently check the private state field's timestamp
before updating their state. However, the issue lies in the fact that
these COM state properties are incorrectly checking the link state
field's timestamp instead of the COM's own state.

Fixes # (issue)
Replacing root link state with root com state at these properties.

## Type of change
- Bug fix (non-breaking change which fixes an issue)


## Checklist

- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./isaaclab.sh --format`
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have updated the changelog and the corresponding version in the
extension's `config/extension.toml` file
- [x] I have added my name to the `CONTRIBUTORS.md` or my name already
exists there