[confirmed]Isochron Scepter + Shrapnel Blast interaction

[gnomefry]

Describe the Bug:

Casting Shrapnel Blast via imprint on Isochron Scepter does not require the caster to pay the additional cost of sacrificing an artifact.

Isochron Scepter should forgive only the mana cost, not mandatory additional costs of the imprinted spell.

https://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=413765

Which card behaved improperly?

Isochron Scepter

Which update are you using? (date, name)Which type? (duel, gauntlet, sealed deck)
version 6-2020 v3 a8bbff706 - gauntlet

What exactly should be the correct behavior/interaction?

Mandatory additional cost must be payed.

Are any other cards possibly affected by this bug?

Lightning Axe - Same issue with additional cost
Deprive - No issue. Additional cost of returning land to hand is properly enforced

[Aswan jaguar]

This savegame always crashes for me possibly while AI tries to copy Shrapnel Blast and in clean games I get the same crash so I don't even know why it doesn't crash for you. Also mentioned here:
viewtopic.php?f=86&t=29580&p=243204&hilit=Isochron+Scepter#p243204
I confirm the Lightning Axe issue.

Also we have the issue that Isochron Scepter and such cards have to copy the card and then cast the copy so they have to pay additional costs, which should work different from normal copying a card in stack like you do with Fork which you don't have to pay additional costs if you don't want to and cards have to respect both. I tested a couple and I don't think any card respects both ways.
Deprive seems to work fine for both but I think it does so by accident for the wrong reason concerning Fork.