You must be very new to SimplyGo.Looks like you were correct; SimplyGo showed <$5 posted on Jan 18; UOB app shows that same amount debited on Jan 20. Transaction in the app was only updated on Jan 21.
Between Jan 18 and Jan 20, I didn't see that deduction marked as "pending" in UOB app. Maybe I'm just too used to looking at VISA credit card statements (without bus/mrt fares debits) where "pending" will appear immediately once a purchase is made.
All these are already in place since it rolled out years ago.

wned