I was able to summon D/D Lamia from my graveyard by its own effect after I had activated Card of Demise, on the same turn, while the "You cannot Special Summon during the turn you activate this card." limit was in effect

I also noticed my extra deck was shining as though I could legally synchro at this time, but after I selected to do so, the summon progress stopped after selecting the non-tuners, no tributes made, no summon. Cards effects to special summon monsters were able to be "activated" from my hand by their little left click menu too, but the game ignored the action the same way, no discard or activation message. Those actions are usually hidden when Domain or Winda is on the field, so it seems like it's bugged