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custom-checkbox and is-valid/is-invalid not working due to priority clashs

See original GitHub issue

Version

Bootstrap 4.0.0

Problem

Using a custom checkbox and the server side validation classes is-valid/is-invalid does not work.

The CSS definitions for this behavior are:

.custom-checkbox .custom-control-input:checked ~ .custom-control-label::before {
    background-color: #007bff;
}

.custom-control-input.is-invalid:checked ~ .custom-control-label::before {
    background-color: #e4606d;
}

The first definition provides the blue color on the normal checked checkbox. The second definition is supposed to override the color to the invalid red. If I count correctly, they have the same priority, so the second definition never applies.

<div class="custom-control custom-checkbox">
  <input checked type="checkbox" class="custom-control-input is-invalid" id="box1">
  <label class="custom-control-label" for="box1"></label>
</div>