DCL.Diagnostics.EcsSystemException: [ParentingTransformSystem]

[sentry]

Sentry Issue: UNITY-EXPLORER-Q0B

System.NullReferenceException: Object reference not set to an instance of an object.
  File "GenericMethods__17.cpp", line 13639, in Get
  File "ECS.Unity__1.cpp", line 26623, in OrphanChildrenOfDeletedEntity
  File "ECS.Unity__1.cpp", line 32334, in OrphanChildrenOfDeletedEntityQuery
  File "ECS.Unity__1.cpp", line 34450, in OrphanChildrenOfDeletedEntityQuery
  File "il2cpp-codegen.h", line 79, in Update
...
(10 additional frame(s) were not displayed)

DCL.Diagnostics.EcsSystemException: [ParentingTransformSystem]
  File "ECS.Core.cpp", line 7508, in Update
  File "Generics__17.cpp", line 10434, in UpdateInternal
  File "Generics__17.cpp", line 31918, in UpdateInternal
  File "Arch.SystemGroups.cpp", line 3427, in Update
  File "Arch.SystemGroups.cpp", line 5717, in Update
...
(2 additional frame(s) were not displayed)

This issue was automatically created by Sentry via Explorer Alpha Github Issue Creation

[github-actions]

Automated Triage

Issue type	bug
Affected area	ECS ParentingTransformSystem / Entity orphaning
Feature category	Primary
Severity	SEV-2 → 1-high

Reasoning: This is a NullReferenceException crash in the ParentingTransformSystem's orphaning logic, reported via Sentry with real user impact. Per issue-triage-categories.md, crashes are a Primary category. The Sentry report indicates it's affecting some users in production, making this SEV-2 (Primary feature broken for some users; platform still partially works).

Labels applied: bug, 1-high, sentry

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Auto-triaged. If labels are incorrect, update issue triage categories or severity policy and re-run triage.

[github-actions]

This is a duplicate of #7489. Multiple Sentry issues report the same ParentingTransformSystem NullReferenceException crash with the same underlying root cause. Please follow #7489 for updates on this issue.

[github-actions]

Automated Triage

Issue type	bug
Affected area	ECS Parenting System (ParentingTransformSystem)
Feature category	Primary — Stability & Crashes
Severity	SEV-2 → 1-high

Reasoning: This is a crash in the core ECS parenting system, specifically a NullReferenceException in OrphanChildrenOfDeletedEntity during ParentingTransformSystem updates. Crashes are classified as Primary category issues. The exception indicates a logic error in entity hierarchy management. Although marked as a duplicate, this needs investigation with the original report to resolve the user-impacting regression.

Labels applied: bug, 1-high, sentry, duplicate

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Auto-triaged. If labels are incorrect, update issue-triage-categories.md or incident-response.md and re-run triage.