# Description

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In the event manager, class based event terms are not registered
properly due to a missing type() call. On [line 387
](https://github.com/isaac-sim/IsaacLab/blob/7de6d6fef9424c95fc68dc767af67ffbe0da6832/source/isaaclab/isaaclab/managers/event_manager.py#L387)of
event_manager.py, the check should be

            if isinstance(term_cfg.func, type(ManagerTermBase)):
otherwise, isinstance always returns false (since ManagerTermBase is an
abstract base class, the isintance method will check that term_cfg.func
is derived from ABC, and not ManagerTermBase). Adding
type(ManagerTermBase) resolves the issue.

Fixes https://github.com/isaac-sim/IsaacLab/issues/2342

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## Type of change

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

## Screenshots

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## 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

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---------
Signed-off-by: Miguel Alonso Jr. <76960110+miguelalonsojr@users.noreply.github.com>
Signed-off-by: Kelly Guo <kellyguo123@hotmail.com>
Co-authored-by: Miguel Alonso Jr. <miguel.alonso@nfinite.app>
Co-authored-by: Mayank Mittal <12863862+Mayankm96@users.noreply.github.com>
Co-authored-by: Kelly Guo <kellyguo123@hotmail.com>