minlength attribute with mask

[Tw1L1ght12]

Describe the bug
If the last character was a letter (exanmple for phone number), minlength will not work and form will send.
If the last character was a number, all works fine.

To Reproduce
CodePen

Expected behavior
A clear and concise description of what you expected to happen.

Environment:

• OS: Windows
• Browser: Firefox. Chrome
• Version: latest