Bug description
When trying to browse a commit in iceberg through Calypso, browsing triggers DNU:
Instance of ClyRing2Environment did not understand #definedClassesInPackage:

To Reproduce
Steps to reproduce the behavior:

1. Go to Iceberg
2. Browse a repository, select a branch, then a commit
3. Right click on Browse this version in Calypso
4. Select a Package
5. See DNU

Version information:

• Pharo Version 14