When you create a sign and begin typing, most of the time but not always, while you are still typing in the sign you cannot backspace. This means you have to exit and create the sign again. See the picture. Sometimes you can delete the text, other times you cannot. Remember, this is all while you are still in the sign interface.
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However, this issue is a duplicate of MCPE-30205. Please add your vote to that issue, and comment there if you have additional information to add.
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