markAsRead api(new) does not work in line OA

[a0919376604]

I’m using the Mark as Read API (/v2/bot/message/markAsRead):
https://developers.line.biz/en/reference/messaging-api/#mark-as-read

In the LINE app, it works correctly — I can see the read indicator in the chat.

But in the LINE Official Account (OA) web chat UI, the same message still shows as unread, even after refreshing the browser.

Is this expected behavior, or am I missing some configuration on the OA side?

How can I make the read status also update correctly in the LINE OA chat UI?