Korlessa and Renari Interaction Incorrect

Korlessa (and effects that let you play from the top of your library) and Renari (granting a spell flash speed) have an implementation bug. If an instant is cast that requires the controller of the pair to choose a creature, then they are unable to cast a valid spell from the top of the deck at flash speed.

Scenario to example:

Player 1: Renari, Merchant of Marvels, Korlessa, Scale Singer, Skanos Dragonheart on field. Kura, the Boundless Sky on top of deck.
Player 2: Cast Flare of Malice.

Expectation: Should be able to cast Kura, the Boundless Sky in response, then select it for Flare of Malice

Current Behavior: Unable to cast.

Start by reproducing the listed scenario with Renari, Korlessa, Skanos Dragonheart, Kura, and Flare of Malice. Trace how the response to Flare of Malice handles choosing a creature while a valid spell can be cast from the top of the library at flash speed. Done means Kura can be cast in response and selected for Flare of Malice.

Written by the indexing model from the issue text.