tttppp The level renderer doesn't recognise water. It might not be necessary to be able to perfectly render all amounts of water, but being able to show a blue background for an N would be good.
andy That is a bug (missing feature) in the Level Editor. Please log it here: https://github.com/andybalaam/rabbit-escape-level-editor/issues (the new repo I recently moved it into). I don't know where to maintain the list of bugs in the Level Editor/Flarum integration. I think probably the same place is the best idea. There is some code here https://github.com/andybalaam/flarum-ext-rabbitescape-leveleditor but it seems too confusing to spread issues across 2 places.