Suddenly cannot get hyperlink data from TextNode

I have a plugin that gets a reference to a ComponentSetNode using figma.importComponentSetByKeyAsync(). It then iterates over the child ComponentNodes, locates various TextNodes within and tries to access the hyperlink property. This used to work, but as of a few days ago all I get is null. These are whole-node links, not ranges.

When I visit the page that contains the ComponentSetNode, everything looks correct. I can click the links and they work.

While debugging, I copied the ComponentSetNode and pasted it into a page in another file. Text styling was preserved on the pasted copy, but the hyperlink information is not present.

This is unlikely to be a new code issue because the published version of the plugin was working and then this happened.

Any thoughts would be greatly appreciated.