validClass: 'is-valid' is never added

[wayneforrest]

I do see the 'is-invalid' class and 'valid'.

But I not see the the 'is-valid' class added.

My JavaScript includes are as such:

<script src="~/lib/jquery/dist/jquery.js"></script>
<script src="~/lib/jquery-validation/dist/jquery.validate.js"></script>
<script src="~/lib/jquery-validation/dist/additional-methods.js"></script>
<script src="~/lib/jquery-validation-unobtrusive/jquery.validate.unobtrusive.js"></script>
<script src="~/lib/jquery-validation-unobtrusive-bootstrap/dist/unobtrusive-bootstrap.js"></script>

 <script src="~/lib/bootstrap/dist/js/bootstrap.bundle.js"></script>

I am using:
Bootstrap v4.3.1
jQuery JavaScript Library v3.3.1