Tentative meeting request not showing when shared calendar

Hello

I have user1, who shares calendar with user2

user2 has owner/editor permissions over user1 calendar

When user1 receives a meeting request, it shows as tentative in his own calendar, but, user2, cant see this meeting request while is in tentative.

user2 needs this, because user2 accepts the meetings from the shared calendar.

This happens on Exchange 2013, on exchange 2010 was working fine.

Any tips on where we are missing some config for this?

Regards