ID:14690 WYSIWYG I/O Input Buffer primitive "<name>" uses bus hold function and is not connected properly. The Quartus Prime software will unmap the illegal buffer and ignore the bus hold property.
CAUSE: The specified I/O Input Buffer primitive has a bus hold property and is not connected properly.
ACTION: Check your design to make sure that the specified input buffer is properly connected to a top-level pin without any other logics in between.