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Misc/NEWS.d/next/Library/2025-02-01-13-01-12.gh-issue-129538.A9ERy9.rst

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+This pull request addresses the issue described in `issue #129538 <https://github.com/python/cpython/issues/129538>`_, where the `IPv6Interface.ip` loses the scope ID information when accessing the IP address.
+
+The problem occurs when an IPv6 address with a scope ID is converted into an `IPv6Interface` and then accessed via the `ip` property, resulting in the loss of the scope ID information. This behavior is unexpected and not documented.
+
+Minimal Example Demonstrating the Issue::
+
+    addr = ipaddress.IPv6Address("fe80::%10")
+    addr_with_prefix = ipaddress.IPv6Interface((addr, 64))
+    print(addr_with_prefix.ip)  # Expected: IPv6Address('fe80::%10'), Actual: IPv6Address('fe80::')
+
+Changes Made:
+1. Fix in `IPv6Interface` Class:
+   - Updated the `IPv6Interface` class to ensure the scope ID is preserved when converting the IP address.
+   - Modified the `ip` property to include the scope ID in the address string.
+
+2. Added Test Case:
+   - Added a test case to verify that the scope ID is preserved when converting the IP address in the `IPv6Interface` class.
+
+Tests and Documentation:
+- Updated the tests in `Lib/test/test_ipaddress.py` to include the new test case.
+- No changes to documentation as the behavior is expected and intuitive.