after add comment for Netgear R7000 to Access List like this
I can see comment on Connection List
but in Registration comment for Netgear R7000 is empty
is it normal?
Netgear R7000 is AP for hAP ac2 (client)
I know, it’s not a bug, it’s a feature 
That is perfectly fine. Comment is related to the connect item, not to the registration item. I know the registration item looks like copy/dependant of connect-item, but it is not. Registration-list is made up from purely dynamic entries and thus, does not have comments.