For existing CIMB debit cards already linked to PayPal, no problem with the transactions, i.e not blocked. They just block those that are not linked yet. If im not mistaken maybank also takes similar approach. (i.e. new linking not allowed, while existing ones can carry on). Those already linked can use Payp as usual until the cards expire.

already changed my PayPal card to BIMB.

No idea then. Probably they start blocking existing users in stages.