I have the same issue with the HUD message version of the UI in My Map
It generates an error and of course not shown in my game as well…
LogValkyrieValidation: Error: Found disallowed object type /Script/BlueprintGraph.K2Node_Event, Referenced by:See end for asset list, Plugin mount point:/firstgame. /firstgame/U/Weaponhud33 /firstgame/U/Weaponhud34 /firstgame/U/Weaponhud1 /firstgame/U/Weaponhud10 /firstgame/U/Weaponhud35 /firstgame/U/Weaponhud11 /firstgame/U/Weaponhud36 /firstgame/U/Weaponhud12 /firstgame/U/Weaponhud37 /firstgame/U/Weaponhud13 /firstgame/U/Weaponhud38 /firstgame/U/Weaponhud14 /firstgame/U/Weaponhud39 /firstgame/U/Weaponhud21 /firstgame/U/Weaponhud15 /firstgame/U/Weaponhud22 /firstgame/U/Weaponhud4 /firstgame/U/Weaponhud23 /firstgame/U/Weaponhud40 /firstgame/U/Weaponhud24 /firstgame/U/Weaponhud16 /firstgame/U/Weaponhud5 /firstgame/U/Weaponhud25 /firstgame/U/Weaponhud6 /firstgame/U/Weaponhud26 /firstgame/U/Weaponhud17 /firstgame/U/Weaponhud7 /firstgame/U/Weaponhud27 /firstgame/U/Weaponhud28 /firstgame/U/Weaponhud8 /firstgame/U/Weaponhud18 /firstgame/U/Weaponhud29 /firstgame/U/Weaponhud9 /firstgame/U/Weaponhud3 /firstgame/U/Weaponhud19 /firstgame/U/Weaponhud30 /firstgame/U/Weaponhud31 /firstgame/U/Weaponhud2 /firstgame/U/Weaponhud20 /firstgame/U/Weaponhud32 /firstgame/U/TestNewhud00 >
That Message is listing all My Hud Blueprints connected and created in UEFN.