Any news regarding this? We have a bunch of blueprint structs we would like to replace with c++ UStructs, but I don’t know how to manually do that without loosing all attribute connections.. Blueprint structs are a trap - once you start using them, they cause so much problems down the line 
This question was created in reference to: [Do StructRedirects work with UserDefinedStructs [Content removed]
Steps to Reproduce
Replace blueprint structs with c++ USTRUCTs
There have been general changes to CoreRedirects that may have helped UserDefinedStruct redirects work, but nothing intentionally meant to improve them. One Fortnite developer redirected a UserDefinedStruct to a c++ struct over the past year and it worked for them, so you should give it a try. There are likely some edge cases that will not work with the redirected struct, but maybe those are not relevant to your content. Even if it apparently works, to be robust you should manually view as large a sample size of possible of the blueprints using the struct and ensure that they look correctly hooked up, and resave the ones that look correct to remove their reliance on the CoreRedirect.
If you can give this a try and let me know of anything not working I would appreciate it; I’d like to start a JIRA listing the known issues.