Extra whitespace in commands between subcommands is ignored in execution, but frowned upon by syntax highlighter.

if you were to type the following:

/give          @s          stone

It would show as an error in the highlighting "Invalid name or uuid ..."
But upon execution, it works perfectly.

This is rather inconsistent, the best fix would be to fix the syntax highlighter than the command execution, because accidental extra spaces might be annoying, but can be ignored regardless.