The market has already reacted to the news, and even if she is allowed to start, Arcadia Queen looks set to continue to drift and could even lose favouritism for the race.
Probabeel would be her natural replacement at the head of the market but she could go on her own rollercoaster throughout today's meeting.
The Matamata mare would be ideally suited by the rain forecast for Melbourne not falling until after the race but the Victorian Met Service is predicting rain, possibly heavy, mid-afternoon.
Firm showers won't be an issue for Probabeel, but heavy rain like that which ruined her chances in the Cox Plate in October could be telling.
So first her rival's morning examination before the scratchings deadline and then the weather could determine whether Probabeel wins the richest prize by a New Zealand racehorse.
The Jamie Richards-trained horse is undefeated this year, having won the Bellmaine Stakes (1200m) first-up before winning last month's Group 1 Futurity Stakes (1400m), which sealed her place among the world's best in 2021.
The All-Star Mile is run at 6.40pm.