GHA hanging in CMD CHECK

Two of my packages, which until recently ran CMD CHECK in GitHub actions without problems, now hang while creating vignettes. If I cancel the action, the Windows builds show

-- R CMD build -----------------------------------------------------------------
* checking for file 'D:\a\phenoptr\phenoptr/DESCRIPTION' ... OK

* preparing 'phenoptr':

* checking DESCRIPTION meta-information ... OK

* installing the package to build vignettes


Execution halted
Error: The operation was canceled.

and the MacOS builds show

── R CMD build ─────────────────────────────────────────────────────────────────
* checking for file ‘.../DESCRIPTION’ ... OK
* preparing ‘phenoptr’:
* checking DESCRIPTION meta-information ... OK
* installing the package to build vignettes

Execution halted
* creating vignettes ...
Error: The operation was canceled.

I don't see how the changes since the last successful builds could cause this. The are primarily

  • Update R versions from 3.6.3 and release to 4.0.0 and release
  • Change one dependency from a GitHub repo to CRAN
  • Major update to /doc
  • Minor updates to /man, /inst and /R

Any hints on where the problem may be are welcome, I'm stumped. One of the repos is here:

Thanks,
Kent

I should add, CMD CHECK runs fine on my local Windows box.

I changed the rcmdcheck call to rcmdcheck::rcmdcheck(args = c("--no-manual","--no-build-vignettes", "--no-vignettes", "--no-examples"), error_on = "error") and it still hangs in the same place. ???

This started working again with no significant changes on my part :-/