Similar to this issue: https://answers.unrealengine.com/questions/79445/found-a-bug-renaming-assetsvariables.html
But now it have been fixed. The only problem is, that when you rename your asset from “myvar” to “MyVar” it doesn’t rename asset in Windows, so physically this asset is still named “myvar”. This can cause some troubles if you’re using Perforce.
This can be avoided if you rename “myvar” to “123”(for example) and then to “MyVar”.