Multifield Validation in Coral3 dialog

Hi Everyone,

I am trying to validate my multifield dialog with maximum items to be allowed. my requirement is like I should be able to add only 5 items in the multifield. If I try to add the 6th item it should show a warning message like maximum 5 items are allowed. I tried the same thing with help of below article.

Experiencing Adobe Experience Manager - Day CQ: AEM 6.3.1.0 - Touch UI Add Min Max Limit to Coral 3 Multifield

But the problem is if I try to add the 6th item it is giving warning message. but on closing of the message it is adding the 6th item as well, which should not happen.

Note: I am using AEM 6.4 version and coral 3 resource types.

Please help .

Thanks,

Bhuvana