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[ECS] Memory leak when a World is initialized without EndSimulationEntityCommandBufferSystem

Package: Entity Component System (ECS)


How to reproduce:
1. Open the project attached in the edit ("")
2. Enter Play mode

Expected results: JobTempAllocs don't exceed their lifetime of 4 frames and therefore become a memory leak
Actual results: Many JobTempAllocs exceed their lifetime of 4 frames as indicated by the many warnings

Reproducible with: ECS 0.14.0-preview.18 - Version 0.16.0-preview.21 (2020.1.17f1, 2020.2.2f1, 2021.1.0b3, 2021.2.0a2)
Could not test with: 2018.4.30f1, 2019.4.18f1 (Errors downgrading)

Warning thrown informing of the leak:
Internal: JobTempAlloc has allocations that are more than 4 frames old - this is not allowed and likely a leak.

  1. Resolution Note:

    User needs to change how the target EntityCommandBufferSystem is created

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