This post is for FE fans alike.
Just been grinding for the new "Support Convo" added to the game recently. Not sure if anyone else is having the same problem, it seems the support bonuses that Mathilda and Clair provide to each other completely vanished as soon as you reach C rank. I thought if I have them reach A or B rank, then those bonuses would return. Unfortunately, that's not the case, as shown in the picture #2.
(Sadly, I did not take any photos of their C rank and B rank prior to making this post.)
Surprised, I immediately tested another support pair, Lukas and Forsyth. For this pair, I recreated the scenario in which Mathilda and Clair first had their C rank conversation. The map is "Lord of the Grave", one of the maps from Wave 2 DLC. As shown in picture #3 through #5, their support bonuses retain, working as intended. Interestingly, their conversation is completely silent on this map, though the sound returns when playing on "non-dlc" maps or replaying their conversation via Mila's Turnwheel.
Note: As of now, I have yet test the remaining support pairs. Perhaps there are more glitches as such to surface. I certainly hope not, as I'm a tad agitated with IntSys's devs at the moment. Had they just left these in the base game, this would not have happened, as they'd have ample time to play test it. Hopefully they'll patch this before next week, when "The Rise of the Deliverance" pack releases in the west.