If you don't specify WithCulture=false or Culture={culture identifier} as metadata on an EmbeddedResource, the AssignCulture task will attempt to determine from the filename whether a file is neutral or belongs to a specific culture. But that can vary by what culture identifiers are known to .NET/the OS on the builder. It's more robust to explicitly specify.

related: https://github.com/MicrosoftDocs/visualstudio-docs/issues/9559