Bug: "Any Key" event strange compile

Development Programming & Scripting Blueprint
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  1. As I said I tried it in same project on new Character blueprint and it compiles fine and sign goes “Goodtogo”
  2. Not really, it just this event on screenshot that makes button stays “dirty” though blueprint compiles successful. Not really event but “get key display name” node. If I make (Any key → Print string) without anything sign goes “GoodToGo”
  3. My character pretty heavy blueprinted. Better if I send whole project I guess but it on 4.12.4