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In Progress

Fixed in 2021.3.22f1, 2022.2.13f1, 2023.1.0b9, 2023.2.0a6

Fix In Review for 2020.3.47f1



Found in





Issue ID




Asset corruption when using the Accelerator cache server



Reproduction steps:
1. Start an empty Accelerator cache server
2. Create and open a Unity project
3. In Project Settings set Cache Server Mode to Enabled and IP address to “localhost:10080”
4. Import the “DemonGirlMesh.FBX“ FBX to the project Assets
5. Open Editor Log and find the artifact name corresponding to the FBX (i.e. “content hash=NAME) uploaded to cacheserver”)
6. Close the project, and open the artifact file (e.g. “Library/Artifacts/NA/NAME”) with a hex editor and remove the first 64 KB
7. Open the project and select the FBX ("File may be corrupted or was serialized with a newer version of Unity" error should be logged)
8. Reimport the FBX (the error should stay, and the asset will be uploaded to the cache server)
9. Close the project and delete its Library
10. Open the project and observe the Console

Expected result: no errors
Actual result: the "File may be corrupted or was serialized with a newer version of Unity" error

Reproduced in: 2020.3.45f1, 2021.3.17f1, 2023.1.0b3, 2023.2.0a1
Not reproduced in: 2021.3.18f1, 2022.2.6f1

Reproduced using: macOS 13.0.1 (Intel), Windows 10 (by the reporter)

1. It is not clear what is causing asset corruption. In this reproduction, the asset is manually corrupted to demonstrate how a corrupt asset is uploaded to the cache server and then distributed
2. Accelerator cache server can be emptied by navigating to its location (e.g. “User/Library/Unity/accelerator”) and emptying the “cachedb“ and “cachedbpending“ folders

  1. Resolution Note (fix version 2023.2.0a6):

    Fixed in 2023.2.0a6

  2. Resolution Note (fix version 2023.1.0b9):

    Fixed in 2023.1.0b9

  3. Resolution Note (fix version 2022.2.13f1):

    Fixed in 2022.2.13f1

  4. Resolution Note (fix version 2021.3.22f1):

    Fixed in 2021.3.22f1

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