If the GUI of a container is open, and data merge changes the CustomName of the container, the displayed name does not update until the user closes and re-opens the container.
For example, data merge block 694 66 562 {CustomName:'{"text":"example"}'} will not update the gui until it is re-opened
https://www.youtube.com/watch?v=Res-jAIoPmg&feature=youtu.be
- duplicates
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MC-75678 Replacing container/inventory names/items with /blockdata or /entitydata doesn't update already opened GUI
- Resolved