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Fixed in 2021.1.X

Fixed in 2019.4.X, 2020.1.X, 2020.2.X



Found in




Issue ID




Assertion failed on expression errors when switching shared mesh rapidly

Mesh Renderer


Reproduction steps:
1. Open user's attached project "" and scene "Scene"
2. Enter Play Mode
3. Observe Console window

Expected result: No errors
Actual result: "Assertion failed on expression: 'a.size == b.size'" errors

Reproducible with: 2019.4.13f1, 2020.1.11f1, 2020.2.0b10, 2021.1.0a3
Could not test with: 2018.4.28f1 (console errors break project)

  1. Response avatar

    Resolution Note (fix version 2021.1):

    Fixed in 2021.1.0a7

    Temporary work around until this is fixed properly:
    Etiher enable 'Update When Offscreen' or disable shadows on the SkinnedMeshRenderers. This will stop the assertion from failing But will cost performance or stop shadows from rendering respectively.

  2. Response avatar

    Resolution Note (fix version 2020.2):

    Fixed in 2020.2.0b14

  3. Response avatar

    Resolution Note (fix version 2020.1):

    Fixed in 2020.1.16f1

  4. Response avatar

    Resolution Note (fix version 2019.4):

    Fixed in 2019.4.16f1

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