Label signs: The cursor jumps to the end

Game mode: Online (any?)
Problem: Bug
Region: any

When you lable a sign and try to add more text in front of an already typed in word, the cursor jumps right after the first pressed key on the end of the whole text box.

Steps on how to reproduce issue: a inscribable sign
2. add a text like “World”
3. reopen the sign to add “Hello” in from of “World”
4. click in front of “World” to put the cursor in front of the “W”
5. now type "Hello "
you expect to have: “Hello World”
but you get: "HWorldello "

Have the same problem.