[waitlisted]Dread Return can target sacrificed creature

[Nexhro]

Describe the Bug:
When casting Dread Return for its flashback cost, it can target a creature card put into the graveyard as part of paying said cost.

Which card did behave improperly ?
Dread Return

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
BfZv2, Gauntlet

What exactly should be the correct behavior/interaction ?
The target has to be chosen before creatures are sacrificed, so it can't target a creature sacrificed to pay the flashback cost.

Are any other cards possibly affected by this bug ?
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[Gargaroz]

Unfixable right now, it's due to the way we're handling Flashback.
Waitlisted.