Just a small thing,
when TileMap (the root, with Grid component, not the actual layer tilemap) is selected,
it shows that selection box gizmo, but you cannot draw or do anything to the tilemap…
while it appears like you could, since all the selection modes etc. work also.
Yes, that is a bit confusing. I think it should not show the gizmo because its on the grid and not on the actual tilemap.