In the matching pattern in _X! in asterisk now working

Question

I wrote an ivr in Asterisk, but after playing the audio file, I did not allow more than one digit.
In the matching pattern in _X! It means a digit or more than a digit, so why not apply in the following example?

[testdialplan]
exten => 33,1,Answer
same => n,Set(TIMEOUT(digit)=3)
same => n,Background(demo-congrats)
same => n,wait(3)
exten => _XXX!,1,NoOp(number1)

Answer 1

_X! means that Asterisk will only try to assemble a number until at least one digit has been obtained. That is, of course, the trivial case. Generally, when doing IVR’s digits arrive individually, so it will always match exactly one digit. The only time that it would match more is on the start of a call, where the digits are in the request URI.

Source: Asterisk Community