When I have a running integration with some custom environments, and I delete one of them or change the name of some of them in UI, after rebuilding, the integration contains also the old environments.
Integration ENVs

      ENV1:                    VALUE1
      ENV2:                    VALUE2
      ENV4:                    VALUE4

After redeploying of integration (deleted ENV2 and changed the name of ENV4 to ENV4NAMEUPDATED in the UI), the integration pod contains ENVs:

      ENV1:                    VALUE1
      ENV2:                    VALUE2
      ENV3:                    VALUE3
      ENV4:                    VALUE4
      ENV4NAMEUPDATED:         VALUE4