Changing case of any string input in BP not accepted

I noticed this →

But the problem is still happened on any string input of BP functions (PrintString, ExecuteConsoleCommand, Append string).
Could you guys fix this. I know it’s not a major improving but it cause annoying and fixing this make UE4 more “Complete”.

Sorry for my bad english.
Very thank you,

HI Parasetamon,

Thank you for the report. I was easily able to reproduce this behavior so I have created JIRA UE-29750. Our developers will be investigating this further.