Kill_Delay in spreadsheet not cancelling lay bet

[LetsGoAgain]

I am placing bets with a very simple rule of

Lay Kill_Delay:4.5

Status then comes back as PLACED with typically the Matched odds & Stake of ZERO while I am testing this DELAY feature

But when I go back to my Betfair account these bets are still showing as UNMATCHED not CANCELLED

My LAY strategy is to place lay bets every 4.5 seconds from the 1 min mark with increasing odds but if I don't know whether the previous bet(s) have been cancelled i am pretty exposed

Any assistance in how to determine that the previous bets have actually been cancelled would be much appreciated