No stairs in Sinking Spire

Hi there, I have no stairs in the Sinking Spire to progress, was a delirium mirror at the start of it and not sure if that effects it but this is the second time now, I have now lost 50ex worth of tablets the rare unique one to unlock all maps in range to this bug, I would like to be compensated for this here is the bug report reference:

839,593,429.

Edit:

Another thing to note a boss spawned from the Fate of the vaal portal mechanic so not sure if this also can effect it.

can confirm, no stair to progress

Bug Report ID: #4164471373

Same thing happened just now with me. Vaal boss spawned, did not notice stairs before he spawned so idea if he might have de-spawned the stairs. Was also an expedition encounter in the map (if that matters). But yes, first floor, no stairs to the 2nd floor.

Bug Report ID: #1608492649

Same problem here.