Persistent "? PackageName" after precompiling in pkg, despite successful "using PackageName"

Question

I am trying to add a package from a github repository. I write

(@v1.7) pkg> registry add https://github.com/organization/registryname.git
(@v1.7) pkg> add PackageName
   Resolving package versions...
  No Changes to `~/.julia/environments/v1.7/Project.toml`
  No Changes to `~/.julia/environments/v1.7/Manifest.toml`
Precompiling project...
  ? PackageName

So I try julia> using PackageName , after which pre-compiling is successful. But when I go back and try pkg> add package-name, I get the same question mark. What does question mark mean? And what is the correct way to debug it to find out what's wrong?