World can't load after crashing game too much by opening and closing structure block ui

Steps to reproduce:

 1. Take a structure block

2.  Open structure block ui

3. Close structure block ui

4. After crashing game restart the world and do above process

5. After doing about 3 or 4 times, Disconnected message will appear, then click OK it

6. Now click on the world

Observations:

You will see that loading bar fill in some amount and world can't be open, only strucked there

Expected:

World should load as before.