Editing Terrain-mod values does not always update

[Dean Bouvier]

Ember 7.x + - When editing the values for an existing terrain-mod applied to an object. For isntance changing the Pos or Mod type and clicking submit, the value will return to the original, also it sometimes accours that changing several of these together and submitting will put the client out of sync and the terrain-mod will no longer appear to change, forcing you to relog into the world to get a proper representation of the terrain-mod.

[Erik Ogenvik (erik-ogenvik)]

This is a known issue, and the cause of is how Eris handles updates from the server.
The short story is that Eris will only add to any existing attribute map, and not replace data. This is to keep the size of the transferred data down. The downside to this is that we sometimes really want to replace data; not just add new.
I'll have to think about this a little more since it involves core functionality in how data is transferred.