// Tested on Windows Server 2012 R2. //
ALWAYS add printers with Action set to Create.
NEVER set it to Replace (or set “Remove this item when it is no longer applied”), unless you want:
All printers with Replace action to be removed and re-created at *every* group policy refresh.
The default printer to be set to the printer that is at 1 in the Order of the group policy printer preferences at *every* group policy refresh. Even if the user selected one of the other printers from the same GPO as default.
Sources:
Personal experience.
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