DCL.Diagnostics.EcsSystemException: [ParentingTransformSystem]

Sentry Issue: [UNITY-EXPLORER-Q0B](https://decentraland.sentry.io/issues/7715575567/)

```
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](https://sentry.io/organizations/decentraland/monitors/alerts/3130340/)

Start with the linked Sentry report and search the repository for ParentingTransformSystem and OrphanChildrenOfDeletedEntity. Trace the entity deletion and parenting path associated with the NullReferenceException, then reproduce the failure and verify that the exception no longer occurs, ideally with regression coverage.

Written by the indexing model from the issue text.