Asset produces error "Failed import for object property" upon loading editor

Filepath for asset referenced in Gamemode blueprint produces error:

/Game/ACustom/Code/cBP_Gamemode: Failed import for ObjectProperty /Game/ACustom/HUD/Game_UI.Game_UI_C:STMSG

Fix up redirectors does not resolve the error, though renaming the asset does seem to override the filepath, which resolves the error.

1. Download, unzip, open attached project.

/Game/ACustom/Code/cBP_Gamemode: Failed import for ObjectProperty /Game/ACustom/HUD/Game_UI.Game_UI_C:STMSG

Results:

Error appears in load errors section of message log:
/Game/ACustom/Code/cBP_Gamemode: Failed import for ObjectProperty /Game/ACustom/HUD/Game_UI.Game_UI_C:STMSG

Expected:

Error does not occur.