Potential bug, discovered device from Black List

Hi,

Below is my Dude (v. 4.0 beta 2) server settings for device discovery:
dude_discovery_settings.JPG
There is an address list named ‘Dont_Discover’ which contains only one IP address of HP printer.
This printer is added to one map, but I want to stop discovering and adding it to another map.
But when Dude is running this printer is discovered and added to map after 60-90 minutes.
If deleted manually, appear again on map after next 60-90 minutes.
Is this bug or I misunderstood meaning of ‘Black List’ settings.

Regards, Grzegorz.