Just an hypothesis:

I am having a similar problem with my package WorldMapR which is failing on r-oldrel-macos-x86_64, and in the log I found that the error comes from

“There is no package called ‘systemfonts’”.

I did not use this package directly so it is obviously not listed as one of my imports, but I have discovered that ‘systemfonts’ is imported by a package which I import for WorldMapR. I have also seen that systemfonts is reporting errors in its own CRAN checks.

As I see that IVPP has many packages listed as imports, maybe that ‘pan’ is also an indirect reverse import for you?

As for how to solve this, I guess we might just need to wait for the owners of ‘pan’ and ‘systemfonts’ to find a solution, or find a way to unlist them as (indirect) reverse imports, which might not be easy.