tel minlength bug?

Hello.
I have a form that i have add a “tel” field.
What i want is to have the visitor add a 10 digit phone number, no more no less digits.

I have add maxlength:10 and i’m trying to add also minlength:10
Even though that it doesn’t exceed the 10 digits (so that works fine) when i add less digits,
i don’t get any error message.

I have tried with required and without, the same results.
Also when i type characters i get the error for that.
Also when i have it as required i get the error for that too..

Why don’t i get the error for less digits?
(i ve checked with inspect and it doesn’t show the “span” tag that it shows when the other errors appears.. obviously..but why?)

[tel your-tel minlength:10 maxlength:10 placeholder "enter your phone number"]

wp: 4.9.8
cf7: 5.0.4