macroConfig not displaying values

Hello,

I have a very simple app that’s simply a slightly modified version of the UI Kit macroConfig Pet Facts example, which I have a compiled working version of on my confluence site. My app is exactly the same, but feeds the two parameters into the label and URL for a button. When the app is added to a page, it behaves as expected (Label=Google, Link=https://google.com). However, when I edit the configuration and the values change (from the defaultConfig to useConfig values), they’re simply not there, and won’t save, i.e. the link button is blank.

The apps and their manifests are both exactly the same - is there anything I should look out for or any common issue I’m encountering here?