Is the mailer generator not working? (Rails 7)

When creating a mailer the erb files seems to be not generated:

? rails g mailer Purchase
      create  app/mailers/purchase_mailer.rb
       error  erb [not found]
      invoke  test_unit
      create    test/mailers/purchase_mailer_test.rb
      create    test/mailers/previews/purchase_mailer_preview.rb

Are we supposed to do this in some other way?
I have looked the docs and searched the forum, but couldn't find much info on this.

I'm also getting this same issue. Weird.

Donn Felker  
After merging the JSP update some time ago, the generator would create an empty folder, but with nothing inside. I guess it was being worked on?

Unfortunately I couldn't successfully merge the latest JSP update to see if this issue was fixed. Something would stop the server from starting if I merge the updates.