Estimated Delivery Date plugin breaks UpdraftPlus popup modals in admin section

File: assets/css/backend.scss

.ui-widget-overlay {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background-color: rgba(15, 23, 42, 0.6);
	backdrop-filter: blur(2px);
	z-index: 100100 !important;
}

When I click any UpdraftPlus function which produces a popup, I cannot click anything because there is an overlay that won't disappear unless I manually delete it from inspect. Further investigation led me to estimated delivery date plugin being responsible. The only way I can fix it is to disable the plugin or to use the temporary workaround snippet below.

Temporary fix I applied:

body .ui-widget-overlay.ui-front {
	z-index: 99998 !important;
}