Whenever block entities are predicted to be broken on the client but later are confirmed to not be broken by the server the server doesn't send block entity information / the client doesn't remember the block entity information.

Steps to Reproduce:

• Start a server with spawn protection
• Op yourself
• Op another player (to enable spawn protection)
• Place a sign and write some text on it
• Deop yourself
• Break the sign

You will see that the client thought the sign could be broken and thus removed block entity data. Either re-logging or reloading the chunks will cause the sign to display properly.