After change text source string missing localization

For example, First, I set a textblock’s text “Up to 4 V 4”, Then run gather text in localization dashboard, and translate it into Chinese to “多达4V4”, compile it and run the game. Everything is ok. But now I change the textblock’s text to “Up to 4V4”, just delete two space, then run gather text again, the world count of Chinese culture return to zero, but open it’s editor panel the text “Up to 4V4” has been translated to "多达4V4“,run game I can not see the Chinese. No matter how many times run gather and compile the world count of Chinese is still zero.

Only if I reset the textblock’s text and set again, can this problem fix, but this will change the key of the text.