You are right, it applied to CPF as well for some Bank.
Yesterday, I want transfer Money to CPF. for DBS, it went through, but for SCB, even the amount is less than 50K, the money was held, and it prompt me the transaction risk (Scam), when I called the Customer service hot line, and state it is transfer to CPF, and definitely not scam. the CSO still explain to me the risk and request me to bear the risk if transfer immediately.