[Rails] rails engine - vendor/bundle and vendor/cache

I created two rails engines.  In one of them 'bundle install' generated only a vendor/cache directory.  In the other one, 'bundle install' created both vendor/cache and vendor/bundle.  The vendor/bundle directory is causing me some problems.  I do not remember what I did differently when creating the two engines.

What causes 'bundle install' to create the vendor/bundle directory and how do I avoid this?

Thanks in advance.

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