Ok so I was on my creative world again, and I had a command block with the command:
/say Oopsy!
and that worked fine, and the command block with the exact same command in it said:
Unknown command: say. Please check that the command exists and that you have permission to use it.
How to reproduce:
Place two command blocks next to each other facing the same way (not into each other).
Type this command into the one on the left and activate it:
/say {color:#de350b}Oopsy!{color}
3. Do the same with the one on the right.
Observed results: The command block on the right doesn’t do the command, because /say “doesn’t exist”.
Expected results: The command block on the right does the same as the one on the left.
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Comments 14

I think it's intended, except that it shouldn't say "Unknown command! Please check if this command exists and if you have permission to use it." and instead it should say "Cannot run this command because an existing repeating command block is currently running this command. Please try disabling that command block then try again." or something like that.
I think it's intended, except that it shouldn't say "Unknown command! Please check if this command exists and if you have permission to use it." and instead it should say "Cannot run this command because an existing repeating command block is currently running this command. Please try disabling that command block then try again." or something like that.