Docs: Add release note

Qiskit · Dec 10, 2024 · 84def52 · 84def52
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diff --git a/releasenotes/notes/fix-packed-instruction-f2620d5aff61269d.yaml b/releasenotes/notes/fix-packed-instruction-f2620d5aff61269d.yaml
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+---
+fixes:
+  - |
+    ``PackedInstruction``, the principal representation of an instance of :class:`.CircuitInstruction`
+    in Rust, has been re-organized to discard its cached instance of a python :class:`.Gate` whenever its
+    operation, parameters, or extra attributes are modified. This results in ``PackedInstruction`` no
+    no longer having shared references between them.