JetBrains Rider Bug Silently Fails to Save Unity Assembly Definition References

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A developer working on a Unity tactical game discovered that JetBrains Rider's Alt+Enter shortcut for adding assembly definition references appeared to work but left .asmdef files unchanged. The issue surfaced after integrating UnityAtoms via the Package Manager, where types like AtomEvent remained unresolved despite seemingly successful imports. Standard troubleshooting steps — including regenerating .csproj/.sln files and clearing the Library folder — failed to resolve the problem. Manually editing the .asmdef file directly in Rider offered only an inconsistent workaround, with references sometimes reverting without a clear trigger. The bug has since been linked to a known JetBrains issue tracker report, RIDER-94834, confirming the problem affects other users as well.

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