Issue with Dynamic Fonts not displaying correctly in standalone

I'm having an issue with dynamic fonts. I'm using Open Sans regular as pictured in the body text of the attached screenshot. The top line of title text should be Open Sans semibold, but instead it's applying a "fake" bold to Open Sans regular.

Both the Regular and Semibold fonts are set to Dynamic and Include Font Data and they both show references to each other in the inspector. In a standalone build on a computer that has these fonts it will display properly, but if those fonts are not already present they display as shown in the screenshot.