Do you have realtime rendering turned off in that viewport? I haven’t done a pass to make sure actions call Invalidate where necessary yet.
Isometric staggered and Hexagonal projection modes aren’t fully supported yet. They’re pretty close to rendering correctly when imported from Tiled (default StaggerIndex and StaggerAxis only, and for hex maps, adjust tile size by HexSideLength IIRC), but I haven’t got math done for editing them yet.