Vignette not rendering correctly on R-universe (web and package build)

[louisaslett]

I haven't encountered this issue with other packages I've developed, but I'm experiencing a problem with my latest hobby project package, {maths.genealogy}. Specifically, the vignette built on R-universe, both for the web front end and for the version installed with the package, differs from what I generate locally and what {pkgdown} produces through GitHub Actions (ie it is not that the vignette only builds as expected locally).

I suspect the issue may be related to the use of an HtmlWidget within the vignette since this is where it becomes unexpectedly blank, but I have been unable to pinpoint the root cause. The GitHub Action from R-universe runs without any errors, so there is nothing to indicate that a problem has arisen.

The vignette, as I would expect it to appear, can be found at this link. I'm linking directly to the section that is
problematic; the code from plot_grviz(g) displays correctly in this instance:

https://genealogy.louisaslett.com/articles/getting-started.html#plotting-the-genealogical-tree

In contrast, the R-universe build using the same source code results blank white for the entire document following plot_grviz(g):

https://louisaslett.r-universe.dev/articles/maths.genealogy/getting-started.html

If you install the package from R-universe binaries, then the vignette is also blank after plot_grviz(g) in the RStudio help pane. However, it works fine in RStudio if installing from source myself with build_vignettes = TRUE.

If anyone has any insights I'd greatly appreciate a pointer!