Eternal pattern not recovered when new pattern applied (Founder Heraldry Heater Shield)

Per DS:

4/11/2018
Title: Eternal pattern not recovered when new pattern applied (Founder Heraldry Heater Shield)
Reproduction Rate: 100%
Blocker? no
Details: As noted above, when a new pattern is applied to an object bearing an eternal pattern, the eternal pattern should be recovered to inventory. The Founder Heraldry Heater Shield comes with an eternal pattern pre-applied which is not recovered with the application of a one-time-use pattern.

Steps to Reproduce:
acquire Founder Heraldry Heater Shield with eternal pattern pre-applied. Apply a consumable Founder Heraldry Heater Shield pattern. The blazon is updated, but the eternal pattern is not recovered.