Trying to fill with a meta item selected or the multi slot shape selection + icon (to select or add shapes), results in the following exception.
java.lang.ArrayIndexOutOfBoundsException: -1 at org.schema.game.common.data.element.ElementKeyMap.getInfoFast(ElementKeyMap.java:652) at org.schema.game.client.view.gui.advancedbuildmode.AdvancedBuildModeShape$5$3.pressedLeftMouse(AdvancedBuildModeShape.java:324) at org.schema.game.client.view.gui.advanced.tools.ButtonResult.leftClick(ButtonResult.java:29) at org.schema.game.client.view.gui.advanced.tools.GUIAdvButton$1.callback(GUIAdvButton.java:28) at org.schema.schine.network.client.GUICallbackController.execute(GUICallbackController.java:64) at org.schema.schine.input.BasicInputController.updateInput(BasicInputController.java:232) at org.schema.game.client.controller.GameClientController.updateStateInput(GameClientController.java:1461) at org.schema.schine.graphicsengine.core.GLFrame.doFrameAndUpdate(GLFrame.java:667) at org.schema.schine.graphicsengine.core.GraphicsContext.mainLoop(GraphicsContext.java:808) at org.schema.schine.graphicsengine.core.GraphicsContext.startUp(GraphicsContext.java:705) at org.schema.game.client.controller.GameMainMenuController.startGraphics(GameMainMenuController.java:1119) at org.schema.game.common.Starter.startMainMenu(Starter.java:1449) at org.schema.game.common.Starter.main(Starter.java:994)