# Description

The modifier should get `obs_dims` before modified by history_buffer
initialization, since Modifiers are called before the history buffer.

Fixes #2460

## Type of change

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

## Screenshots

<img width="1594" alt="screenshots2025-05-10 14 19 57"
src="https://github.com/user-attachments/assets/6d1d65e4-3ac4-4842-8a14-5cafb5521045"
/>

## 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
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] 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
Co-authored-by: James Tigue <166445701+jtigue-bdai@users.noreply.github.com>