I'm having the opposite issue to this one. The
$ bundle -v
Bundler version 1.12.5
$ ruby -v
ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-linux]
After a couple of days I stumbled upon another problem where I had to run
spring stop. After that it started to generate it correctly.
My bad for suspending my pc and have running those processes for weeks instead of trying the good old shutdown.