namh's above transaction posted on Wednesday which was Public Holiday - unless Indonesia not a public holiday.

Same as CoffeeDude transaction posted on 16 January which falls on a Thursday where both effective rate higher than Visa's.
You might just be right, AEON cards go haywire on weekends, hahaha. But your effective rate was not super low but near spot rate whereas bear bear's USD/MYR rate was really unbelievable.

Let's see more results, everyone - please spread your transactions with your AEON cards to fall on weekdays and weekends.