Steps to reproduce problem:
place a hanging sign
enter some text
use ctrl+a to select all text and ctrl+c to copy them
close the ui, then place a new hanging sign
try paste text with ctrl+v,You will find that you can't paste or enter anything.
if problem not occur, repeat 4-6 for a few times
sometimes you may need to remove the first sign and then paste text to the new sign and this problem occurs randomly
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is duplicated by 1
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Alternative steps to reproduce:
Place a hanging sign.
Switch to another window and copy any text from there.
Return to minecraft.
Paste the text into a hanging sign (CTRL+V).
Close text entry.
Place a hanging sign.
Paste the text into a hanging sign (CTRL+V).
It seems that for a regular (non-hanging) sign it works a little differently, you need to switch to the text copy window without using ALT+TAB.
This also happens randomly, no ALT+TAB required. When it happened to me, I could also not type in chat or in a book. Have to quit MC and relaunch the game.