qiskit/releasenotes/notes/1.2/restrict-split2q-d51d840cc7...

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---
fixes:
- |
Fixed an edge case when transpiling a circuit with ``optimization_level`` 2 or 3 with an
incomplete 1-qubit basis gate set on a circuit containing 2-qubit gates, that can be
implemented as a product of single qubit gates. This bug is resolved by restricting
:class:`.Split2QUnitaries` to consider only :class:`.UnitaryGate` objects.
Fixed `#12970 <https://github.com/Qiskit/qiskit/issues/12970>`__.