Package fresh but not in manifest

[CrowdHailer]

I'm doing some merging of branches and got this. I got a merge conflict in the manifest file and just took one branches with the hope of being able to run gleam update/gleam add.

$ (cd eyg; GLEAM_LOG=trace gleam add glexer)
DEBUG download_deps: locking_build_directory path="/home/peter/Projects/project_wisdom/eyg/build/packages"
TRACE download_deps: reading_file path="/home/peter/Projects/project_wisdom/eyg/gleam.toml"
DEBUG download_deps: reading_manifest_toml
TRACE download_deps: reading_file path="/home/peter/Projects/project_wisdom/eyg/manifest.toml"
DEBUG download_deps: manifest_outdated
  Resolving versions
error: Fatal compiler bug!

This is a bug in the Gleam compiler, sorry!

Please report this crash to https://github.com/gleam-lang/gleam/issues/new
and include this error message with your report.

Panic: compiler-core/src/config.rs:276
    Package fresh but not in manifest
Gleam version: 1.0.0
Operating system: linux

If you can also share your code and say what file you were editing or any
steps to reproduce the crash that would be a great help.

You may also want to try again with the `GLEAM_LOG=trace` environment
variable set.

[lpil]

Closing in favour of https://github.com/gleam-lang/gleam/issues/2822