Ancient Vows Relic Quest Act 2 Cruelty Bug

There is a bug for the quest ‘Ancient Vows’ in Act 2 Cruelty.
It is not possible to place the two relics in the altar when playing with mouse and keyboard. Problem: you move the mouse over the altar and the two slots appear, as soon as you remove the mouse pointer the altar window also disappears. If you drag and drop the relics onto the altar, the altar window does not appear. So there is currently no way to place the relics. In Act 2 Normal Mode it worked without any problems.
Or does it not work because you already got the bonus in Act 2 Normal Mode?

I have the same issue, did you happen to find the solution?