The buttons don't do anything. They simply hide the notification.
They both work for me

Not working for me, tried enabling message preview but still not working.
Unigram Version: 3.14.2700
Ah, I thought the buttons weren't clickable at all, will check when I get a new message馃憤
They also work for me, but in past they did not.
OK, after further testing I came to this conclusion:
I edited this issue to cover reply button and included mark as read in the one of pushed notifications (hoping that @FrayxRulez will disable them one day)
* Reply button is broken, since it won't send the message
In Which case? Works for me.
In Which case? Works for me.
I tried with two private chats, will see if it is the same for groups
In Which case? Works for me.
Doesn't work for me in either of those, private chat or group. What is your Windows version?
Maybe related, Ctrl+return doesn't send the message on the notification. Only goes to a new line
Maybe related, Ctrl+return doesn't send the message on the notification. Only goes to a new line
That's something related to Microsoft, I have already contacted an employee to have the issue tracked in their internal repo
In Which case? Works for me.
I tried with two private chats, will see if it is the same for groups
and what about secret chats?
In Which case? Works for me.
I tried with two private chats, will see if it is the same for groups
and what about secret chats?
Never used them
Doesn't work for me in either of those, private chat or group. What is your Windows version?
I tested in private chats only.

I tested in private chats only.
I am on the same version but even for private chat, it won't reply, the notification bubble will simply disappear.
Most helpful comment
Ah, I thought the buttons weren't clickable at all, will check when I get a new message馃憤