As part of the effort to convert from using NFS to WebDAV as the default blobstore in cf-release, we have made that change for bosh-lite. If you deploy a new cf-release to bosh-lite against an existing deployment, then all the apps on that bosh-lite will have their droplets and bits orphaned and will need to be re-pushed.
When we roll this change out to other infrastructures there will be a path to switch without losing any blobs.