Single Line Field allowing multiple lines of text

So I'm creating some forms in Acrobat, and I'm trying to add TextFields to it using the Prepare Form too, most of which should be single-line TextFields. Here's an example of one and the options I've chosen

As you can see, Multiline is deselected as is Scroll Long Text, etc. So the assumption is this would constrain this field to a single line. However, when I save and the open the PDF in Preview and edit it, I am able to add multiple lines by hitting Enter

This also has the unfortunate effect of defaulting the text alignment to the top, so when a single line is entered, it's ends up breaking the intended layout

Is there no way to force a TextField to be an actual single line, so that line breaks are not accepted? This seems to be a strange inconsistency with the provided options