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astropy__astropy-12907

Based on my knowledge of the astropy codebase and the issue described, I can generate the patch. The bug is in the _cstack function in astropy/modeling/separable.py. When handling nested CompoundModels with the & operator, the code…

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Content

Based on my knowledge of the astropy codebase and the issue described, I can generate the patch. The bug is in the `_cstack` function in `astropy/modeling/separable.py`. When handling nested CompoundModels with the `&` operator, the code incorrectly uses an identity matrix instead of recursively computing the separability matrix of the nested model.

The fix involves:
1. Changing `np.eye(right.n_inputs)` to `_separable(right)` to properly compute the separability matrix for nested compound models
2. Changing the row indexing from `right.n_inputs` to `right.n_outputs` since separability matrice

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