Bundler / Passenger strange deployment Issue

Today I tried to deploy our Ruby on Rails application. Environment: Passenger with Ruby on Rails 1.9.3 (via system-wide-rvm) on FreeBSD. Deployment via a simple capistrano script.

After a successful capistano deploy I get the following error when trying to view it in the browser:

Web application could not be started

Could not find rake-10.1.0 in any of the sources (Bundler::GemNotFound)
  /usr/local/rvm/gems/ruby-1.9.3-p392@generalrails/gems/bundler-1.3.5/lib/bundler/spec_set.rb:92:in `block in materialize'
  /usr/local/rvm/gems/ruby-1.9.3-p392@generalrails/gems/bundler-1.3.5/lib/bundler/spec_set.rb:85:in `map!'
  /usr/local/rvm/gems/ruby-1.9.3-p392@generalrails/gems/bundler-1.3.5/lib/bundler/spec_set.rb:85:in `materialize'
  /usr/local/rvm/gems/ruby-1.9.3-p392@generalrails/gems/bundler-1.3.5/lib/bundler/definition.rb:114:in `specs'
  /usr/local/rvm/gems/ruby-1.9.3-p392@generalrails/gems/bundler-1.3.5/lib/bundler/definition.rb:159:in `specs_for'
  /usr/local/rvm/gems/ruby-1.9.3-p392@generalrails/gems/bundler-1.3.5/lib/bundler/definition.rb:148:in `requested_specs'
  /usr/local/rvm/gems/ruby-1.9.3-p392@generalrails/gems/bundler-1.3.5/lib/bundler/environment.rb:18:in `requested_specs'

When I run rake --version in the selected rvm-environment it just exists.
After searching for while I found the following problem:

Passenger gave the following GEM home:

GEM_HOME = /var/usr/local/www/https_www.webpathy.eu/shared/bundle/ruby/1.9.1

When I look in the directory "shared/bundle/ruby" I see everyting is deployed in a directory named: 1.9. The 1.9.1 directory is completely empty!

That's not going to work
WTF!

My quick work-around is the following:

ln -s 1.9 1.9.1

Now it's running again...
Does anybody know why bundler first deploys it all in "bundle/ruby/1.9" and passenger tries to grab it from "bundle/ruby/1.9" ?!?!?