Extension validation for multiple file uploads not evaluating correctly.

[Michael Huckleberry]

Subject of the issue

The extension validation for file upload doesn't validate more than 1 file. I attached a jsfiddle below that is primed to show the issue. If you attach 2 files to the upload control, one valid and one invalid, you'll see the validation doesn't trigger. If you then attach only one invalid file the validation works.

Your environment

Using CDN of 1.19.3 of jquery.validate.min.js and additional-methods.min.js

Steps to reproduce

Select 2 files in the file input control, one valid extension and one invalid, then submit the form. Then load up the control with 1 valid file and submit the form.
https://jsfiddle.net/tp03o16u/

Expected behavior

Each file should be evaluated separately and there should be a response for the entire group of files in the input control.

Actual behavior

The first file is validated and I believe it stops there and doesn't validate any further.

[github-actions]

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