Steps to reproduce

Add a Media & Text block to a post or page, and enable the "Crop to Fill Entire Column" setting from the block options

What I expected

That the media in the block would be shown taking up the full dimensions of the column:

What happened instead

The image didn't fill the full column:

Browser / OS version

macOS 10.14.6, Safari 12.1.2/Chrome 75.0.3770.142

Context / Source

Reported in #14353586-hc, was able to duplicate on my test site

Issue doesn't appear to happen in Firefox -- this CSS wasn't appearing to be added to the block in Chrome and Safari, but I was able to provide it to the user to add in the Customizer to resolve the issue:

/* hide image in the media & text block when image fill is selected */
.wp-block-media-text.is-image-fill figure > img {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0,0,0,0);
	border: 0;
}

/* make background full height on media & text block when image fill is selected */
.wp-block-media-text.is-image-fill figure {
	height: 100%;
	min-height: 250px;
	background-size: cover;
}