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1) Open 2 instances of the editor logged in as 2 different users on SVN. Create an asset named Asset1 and sync it across both editors
2) In editor one, rename Asset1 to Asset2. Submit.
3) In editor two, refresh and sync Asset 1. It will be replaced by a redirector. LoadReplacementPackage will be called to reload "Asset1"
4) In editor two, sync the whole content folder. Asset 2 will be added to the folder, LoadReplacementPackage will be called on "None", and the editor will crash
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-63030 in the post.