I was in the process of making a command block to run a /setblock command using relative coordinates, when I copied some code from a different command block. I then pasted said command into a different command block. I expected the blocks to get placed where I had specified in the command, however, the blocks were not placed, and the output (within the command block GUI) said that my number was not valid.
So far I haven't been able to recreate the bug other than by copying the code from the screwy command block into a different command block.
In the picture, it says " '1' is not a valid number." There are two ones, but I worked it out that the z-coordinate value was the one it didn't like.
This just stated happening to me. I don't understand what is causing it at all. I am also on Mac if that has anything to do with it.
Edit: Figured out the issue. It had invalid characters next to the number when you coppied it. Basically just click next to the number, and backspace past the invalid number. This will fix it. as it will remove the invalid characters. Hope this helps