A licensee has reported that the following repro steps can result in a "Failed to merge bones" error:
Internal only: a repro project has been provided. See repro steps for a faster repro.
Known workaround
Set the console variable "Interchange.FeatureFlags.Import.FBX" to false to use legacy FBX import, instead of Interchange.
Steps to Reproduce
Actual Result: Dialog pops up stating "Failed to merge bones". Selecting 'Yes' or 'No' does not result in the same hierarchy as a reimport done with Legacy.
Expected result: No dialog popping up. Asset is reimported as with legacy.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-325794 in the post.
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Component | UE - Editor - Content Pipeline - Import and Export |
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Affects Versions | 5.5 |
Target Fix | 5.7 |
Fix Commit | 46318776 |
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Created | Sep 15, 2025 |
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Resolved | Sep 29, 2025 |
Updated | Oct 6, 2025 |