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Cristi PogaceanandCopilot Autofix powered by AI
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# Description Preserve populated derived node children through optional initialization and give copied children independent ownership by their copied parent. - Track initialization from a source in `NodeState` and guard generated optional-default recreation without removing the optional initialization hook. - Reuse `CloneChild` for dynamic children, generated typed children, and method argument properties. Preserve the clone root's existing external parent. - Add cross-model initialization/copy regressions, method-argument and nested-child ownership tests, and inherited alarm-subtree checks. This PR contains only the six files for this fix group. Certificate-store, runtime-type-loader, publish-queue and transport-exception fixes are separate work. ## Related Issues Fixes #4525. Fixes #4526. ## Validation Fresh focused Release/net10.0 checks on the final base: | Fixture | Passed | Failed | Skipped | | --- | ---: | ---: | ---: | | CrossModelInstanceTypeDefinitionGeneratorTests | 9 | 0 | 0 | | Types NodeStateTests | 227 | 0 | 0 | | Core StateTypesTests | 13 | 0 | 0 | All three test commands exited 0. `git diff --check` and the changed-file diagnostic check are clean. Regression proof was also executed in the isolated worktree: with the three production changes reversed, six generator cases failed with the missing derived Temperature child while three controls passed; two copy cases failed parent-identity assertions while the external-parent/absent-arguments control passed. The production fix was restored and the focused checks are green. The retained red runs preceded the later upstream synchronization; the affected production paths were unchanged by that synchronization. Windows win-x64 NativeAOT publish and native execution also passed: main 178/178, Historian 2/2, MCP 3/3, no skips, every invocation exit 0. These native runs preceded the final CTT-configuration/notes-only fast-forward; this PR's six files were unchanged. Local validation is intentionally change-scoped for this work, with the full matrix and repository-wide checks left to PR CI. Repository guidance and test assertions/timeouts were not modified. Local commands used a NuGet v2 source override and disabled audit only on the command line; CI feed/audit policy is unchanged. Earlier broad attempts are not claimed as a completed local gate: an unmodified-base durable restart timeout was reproduced before synchronization (the later durable run passed), and the net48 runner stalled after recording passing client tests. A direct client retry subsequently exited 0, but the full net48 matrix was not completed. Those results are not substituted for the focused evidence above. ## Checklist - [x] I have signed the CLA and read the CONTRIBUTING doc. - [x] I have added regression tests and demonstrated failure without the production fix. - [x] The focused tests pass; no new compiler diagnostics were reported by those builds. - [ ] Coverage and the full net48/net10.0 matrix are verified by PR CI. - [ ] All CI, CodeQL, and review feedback is addressed. --------- Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>