Steps to reproduce:

• Register Listener
• Create a sign and write something to the first line
  Expected output:

  [19:25:29 INFO]: from event: Line 1
  [19:25:29 INFO]: from blockstate: Line 1
  [19:25:29 INFO]: after update: Line 1
  

  Output:
  [19:25:29 INFO]: from event: Line 1
  [19:25:29 INFO]: from blockstate:
  [19:25:29 INFO]: after update:
  Code:

  SignTest.java

  	@EventHandler
  	public void onSignCreate(SignChangeEvent e) {
  		System.out.println("from event: " + e.getLine(0));
  		Sign s = ((Sign) e.getBlock().getState());
  		System.out.println("from blockstate:" + s.getLine(0));
  		s.update(true);
  		System.out.println("after update:" + s.getLine(0));
  	}