"International Telephone Input" + "Prevent duplicate submissions" prevents form submission

Problem/Motivation

When "Prevent duplicate submissions for all webforms" is enabled, invalid inputs in phone fields with JS "International Telephone Input" Widget prevent form submissions, even after the input was corrected/valid again.

Steps to reproduce

1. In global webform settings "/admin/structure/webform/config", in the "Form behaviors" section, enable the option "Prevent duplicate submissions for all webforms"
2. Create a form with a phone field
3. Enable "Enhance support for international phone numbers" on the phone field
4. Fill out the form with any invalid phone number, e.g. "123"
5. (The validation kicks in onblur, but do not correct the error)
6. Click the submit button
7. The form will not be submitted, but the button will become disabled.
8. Correcting the phone number now will not remove the ".is-disabled" class, there is no way to submit the form anymore (except completely reloading the page)

Side notes

Fixing an invalid phone number before clicking the submit button works as expected and allows form submissions.
The form is not submitted, there is no request visible in the dev tools. I assume the problem is on client side JS level.
My tests were done with a webform embedded in a paragraph entity inside a node entity. Ajax was disabled.
The problem is isolated to incorrect inputs. An empty + required phone field is handled by native browser validation and can be corrected even after clicking the submit button.
The problem seems to be isolated to the phone widget, an invalid Chosen JS replaced < select > did allow form submissions.