BUG mutation of object valuesToSet in update blueprints action

**Node version**: v14.20.0
**Sails version** _(sails)_: v1.5.7
**ORM hook version** _(sails-hook-orm)_: 4.0.2
**Sockets hook version** _(sails-hook-sockets)_: 2.0.4
**Organics hook version** _(sails-hook-organics)_:
**Grunt hook version** _(sails-hook-grunt)_: 5.0.0
**Uploads hook version** _(sails-hook-uploads)_:
**DB adapter & version** _(e.g. sails-mysql@5.55.5)_: sails-mongo: "2.0.1"
**Skipper adapter & version** _(e.g. skipper-s3@5.55.5)_: 0.6.0

The issue identifies the update blueprints action as the affected entry point and provides Sails, Node.js, ORM, sockets, and Mongo adapter versions. Start by locating that action and reproducing the reported mutation of object valuesToSet with the listed versions. Done means the valuesToSet object is no longer mutated, with a regression test covering the behavior.

Written by the indexing model from the issue text.