Blasphemy and Cost Multiplier Support

I am not sure if this behavior is consistent with other metagems, however, socketing a support gem a curse socketed into a blasphemy gem appears to attempt to apply the cost multiplier to the spirit cost of blasphemy when sanity checking if the gem can be added to the link, but does not impact the spirit cost.

As an example, if I have a witch with 100 base spirit and no spirit from gear, and they have a Blasphemy link socketed with Temporal chains, and the blasphemy is active, and they also have grim harvest with clarity support active, they will have 0/100 spirit remaining unallocated. Attempting to socket the heightened curse support (120% cost multiplier) into the blasphemy link will be stopped by the game, due to insufficient spirit.

If you then de-activate the grim harvest link or remove it, going to 40/100 spirit, the heightened curse support can now be successfully socketed into the blasphemy link, but does not consume any additional spirit. You can then re-activate the grim harvest link, going back to 0/100 spirit, and the blasphemy will continue to be active with heightened curse support.

I am not sure if heightened curse in this situation should increase the spirit cost to 72 spirit, or if the game should just allow the support to be socketed when spirit is fully consumed, but at least one side of this interaction is a bug.