When i paste a command in to bash and hit enter, the next lines prompt contains half of the previous issued command. E.G:
host:/Users/user $ some really long command pasted in
-bash: some: command not found
host:/Users/user $ some really command pasFoo
-bash: Foo: command not found
i typed Foo at the next prompt and hit enter. You can see that it only recognized the Foo command so the visual of the previous command is 'not really there'