Describe the bug

gh version 2.30.0 (2023-05-30)
https://github.com/cli/cli/releases/tag/v2.30.0

Aliasing an extension command prints it in the gh alias list, but does not make it executable.
gh 2.29 or earlier worked

Steps to reproduce the behavior

1. gh extension install srz-zumix/gh-activity-report
2. gh alias set ar activity-report
3. gh ar error unknown command "ar" for "gh"

Logs

$ gh alias set ar activity-report                  
- Adding alias for ar: activity-report
✓ Added alias.

$ gh alias list                                    
ar: activity-report

$ gh ar                                            
unknown command "ar" for "gh"