Unfortunately, APs see/inspect these packets too, even if they only ignore/drop them.
Michael is confirming your thought(s) that your ZD setting should be inherited by your AP(s). But also suggesting that verifying IPv4 and IPv6 settings in the AP or AP group might be a good idea, in order to achieve the performance you desire in your environment.
"I have verified it. By default the IPv4 is enabled for ZD in the Setup wizard and for APs it is IPv4&IPv6. I agree with your point that the default settings need to be changed. You can contact your local SE to raise an FR(Future Request) so that it may get fixed in the future firmware releases or if you want I can forward your contact details to the SE. For now,the work around is to manually change the IP version as IPv4 only for the APs or to enable IPv6 support for ZD to restrict the IPv6 Clients."