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## Proposed changes The master378 publish timer reset timestamps for already-ready subscriptions, breaking oldest-first ordering among equal-priority subscriptions. - Restore the ready-subscription guard. - Recheck readiness under the queue lock to prevent concurrent timestamp resets. - Replace invalid requeue coverage with a deterministic ordering regression test. ## Related Issues ## Types of changes What types of changes does your code introduce? _Put an `x` in the boxes that apply. You can also fill these out after creating the PR._ - [x] Bugfix (non-breaking change which fixes an issue) - [ ] Enhancement (non-breaking change which adds functionality) - [x] Test enhancement (non-breaking change to increase test coverage) - [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected, requires version increase of Nuget packages) - [ ] Documentation Update (if none of the other choices apply) ## Checklist _Put an `x` in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code._ - [ ] I have read the [CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md) doc. - [ ] I have signed the [CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf). - [x] I ran tests locally with my changes, all passed. - [ ] I fixed all failing tests in the CI pipelines. - [ ] I fixed all introduced issues with CodeQL and LGTM. - [x] I have added tests that prove my fix is effective or that my feature works and increased code coverage. - [ ] I have added necessary documentation (if appropriate). - [ ] Any dependent changes have been merged and published in downstream modules. ## Further comments Retains the single-lock lost-wakeup correction from the preceding change while preserving subscription scheduling timestamps. <!-- START COPILOT CODING AGENT SUFFIX --> - Fixes #3997 --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: marcschier <marcschier@hotmail.com> Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 892a02b2-efa4-4a3b-bc9a-5e42103f4c26