I do not think you are missing anything. As a new feature, there are a few other things needing updates. Best you can do is switch to 3 decimals, but sadly is returning only 2 decimals for me.
You can always manually edit the values by doing an object >> Expand Appearance until this is addressed
They should probably make the default font something in a clean sans serif, and that has opentype fractions, along with an industry-standard color like magenta or cyan for dimensions. The Adobe prerelease would benefit with more people who work fulltime in the industry using Adobe products doing final production work over 8 hours a day.
Feet and inch marks should be in italics, but most regular cuts of fonts do not have one for that. I left my screenshot as is, to show another common issue.
You can also share your feedback here, on this particular new feature.
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