After travelling between dimensions, right-clicking the command blocks do nothing. They don't show their GUIs.
After relogging, you can access to the command blocks
After travelling between dimensions, right-clicking the command blocks do nothing. They don't show their GUIs.
After relogging, you can access to the command blocks
I can confirm.
In a new world using 15w36c I went to the nether, placed a command block and couldn't open. Relogging did fix.
edit: relates to MC-87872