Undo function breaks local variables in Blueprint Function after compiling

Blueprint functions appear to correctly associate local variables when renaming the function. However when undoing a rename with ctrl-z the local variables appear to lose their association. Redoing after undoing appears to fix the issue.

This was reported and testing in 4.24.3 (CL-11590370). This was reproduced in 4.25.3 (CL-13942748), and 4.26 Preview 2 (CL-14419252)
 

1. Open the UE4 Editor and create a Blank project
2. Create an Actor Blueprint
3. Create a function
4. Create a local variable
5. Add a setter of the local variable to the function graph and connect the two
6. Compile and save, then change the function name
7. Ctrl-Z to undo function name, then compile and save

Results: Warnings will appear for each instance of the local variables use in the graph.

Expected: successfully compile.

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