Cryptic assertion failure in AudioImporter.SaveAndReimport()

I intermittently get this error when calling SaveAndReimport() on an AudioImporter:

Assertion failed on expression: ‘p == previewData.m_PreviewData.end()’

Anyone have any idea what this could possibly mean? It seems like this error means the reimport failed, but I have no real way of knowing if that’s true or not.

As an aside, this looks like some bad code, Unity. Who gives an object a member with the same name?

Getting this error today in 5.5.0f3 but not sure why - it occurred after a full library reimport in which some assets were corrupted due to remaining as git LFS pointers instead of being resolved into files. Looking into it more.