Using RDS 2012 R2 server, we are deploying 4 or so printers via group policy.
When a user sets them to default printer and logs off, when they log back on the default has changed to another non mapped printer (local printer).
Do not set default client printer to be default printer in a session is enabled in GPO.
Tested the same outcome on a 2008 r2 non rds server as well.