When I add commands to these signs and formatting using blockdata, it displays as shown. When I close the world and reload it, all the text and formatting is missing.
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Grum's comment on MC-87143:
It now only accepts proper json for each line and each line has to exist.
It will show as an empty sign otherwise.
blockdata ~-1 ~-1 ~6 {Text1:"{\"text\":\"[Settings]\",\"bold\":true,\"color\":\"aqua\"}",Text2:"{\"text\":\"Flashing Colors\"}",Text3:"",Text4:"{\"text\":\"Enabled\",\"color\":\"green\"}"}
Shouldn't this still be a bug, since the text still displays until relog. If it doesn't accept it shouldn't the command not run successfully instead? Intended behavior should be something such as just not accepting the command as incorrectly written or displaying it as a blank sign instead of strangely displaying it correctly until you rejoin the world.
I've noticed this too. The reason is because the other text lines are empty. It's strange... To make it stay, you have to put at least a space (" ") in the other text lines with the blockdata command.