If you add a banner to a map after adding a named one, the new one will be black even if it is coloured.

Steps:
1. get a map and activate it
2. Rename a banner and place it, then add it to your map
3. place another banner and add it to your map, it will be black

Because of this it is not possible to have 2 coloured named banners.
This bug happens with every colour banner and on every zoom level of a map.

this is my first bug report, so I am sorry if I did it wrong