It is not possible to place any blocks such as ejectors, bombs of any mod or tanks of any mod in The Other dimension. Is this intentional? Because let's face it, picking up Soul Lava using buckets or Mekanism tank in bucket mode is not practical at all.

As many have also discussed and asked on the discord, it seems to be intentional behavior, as nothing but decorative blocks can be placed, as for the fluids, use an ender bucket with tanks on the otherside of the tank channel