Baldur’s Gate 2: does Lavok’s planar sphere remain in Athkatla’s bridge district after the events of the game

“The monster’s eyes blazed with real flames as it did pass”

Would the draconic prophecy specify the conditions for their being rebound once released?

In Baldur’s Gate Descent into Avernus nothing about the Silvershield family is mentioned

Tensions were high at TSR then, can’t remember the details but it was the beginning of the end of the First Age.