Cannot satisfy package id when package is added to project as a dependency.

[Anomalocaridid]

Whenever I add a package as a dependency to a project's package.yaml file or its .cabal file and try to check the project's code, hdevtools just says
cannot satisfy -package-id (package-version-random characters)

(use -v for more information)

However, if I remove the package from the project file, it appears to resume normal behavior.

[Anomalocaridid]

Apparently, I was able to fix the issue without removing the pack I wanted to add by removing the project from its test suite's build depends section in package.yaml, although I could not run the test suite until I changed it back.

[Anomalocaridid]

The bug appears to have remained fixed even after I put the project back in the package.yaml file. I'm not sure what's different, as the file appears exactly the same as when I started. I think I might have messed up the whitespace in package.yaml initially. In any case, the issue appears to have been resolved.