v3.3.0: fixed toxic gas rooms marking their entrance as char placeable

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/rooms/special/ToxicGasRoom.java

@@ -111,6 +111,9 @@ public class ToxicGasRoom extends SpecialRoom {
 
 	@Override
 	public boolean canPlaceCharacter(Point p, Level l) {
+		if (!super.canPlaceCharacter(p, l)) {
+			return false;
+		}
 		Blob gas = l.blobs.get(ToxicGas.class);
 		return gas == null || gas.volume == 0 || gas.cur[l.pointToCell(p)] == 0;
 	}