a simple thing to check:
if you accidentally have any extra spaces in your Command's 'pattern' text box (this happens sometimes when copying and pasting, for example, due to accidental over-highlighting), as thus then your input of 'say banana' won't match up to that pattern with those extra spaces in it. Especially check if you got a space before 'say' and after ' #text# ' in your Command's 'pattern' text box, or if you got a double space between 'say' and ' #text# '.
I just tested it, and it works fine for me. So, I think it probably will be an extra accidental space character within your Command's 'pattern' text box.
if this is the issue, welcome to the world of coding, where you must be 100% typo and spelling error free, and grammer (syntax~format) perfect, laughs.