Description

When the following setting is added to DefaultEngine.ini, the AnimNode content is not applied during PIE execution.

[/Script/Engine.EditorStreamingSettings]
s.AsyncLoadingThreadEnabled=True

If the AnimBP is recompiled once, the AnimNode behavior is applied correctly. Additionally, when s.AsyncLoadingThreadEnabled=False, this issue does not occur and the AnimNode works as expected.

Steps to Reproduce
  • Open the attached project
  • Run PIE

Expected:
The result of the BlendMask in LayeredBlendPerBone is applied, and only the front wheels of the vehicle rotate.

Result:
The result of the BlendMask in LayeredBlendPerBone is not applied, and the vehicle’s wheels do not rotate.

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Unresolved
CreatedMar 16, 2026
UpdatedMay 1, 2026
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