Deathrattles of 'Flagbearer' are Untriggered anyway

I just finished a ‘Battlegrounds’ game with the choice of PIRATE. What I wanted was the great association between the ‘Cruise Controller’ and ‘Sky Pirate Flagbearer’. The Flagbearer’s deathrattle should be triggered after attack increase. BUT, the deathrattles just disappeared when I faced the ‘Leapfrogger’! The System ignored all my Flagbear’s deathrattle after the death of ‘Leapfrogger’, only dealing with the frogger’s. What was worse? The association bewteen pirates was just disappeared for the WHOLE game after our first meet! I think it might be a BUG that the ‘Leapfrogger’ takes over all of the ‘Flagbearer’ anyway especially when Both sides have the ‘Rivendare’. Hope designers could check it.

Noticed that strange behaviour too.
Firestone replay link: replays.firestoneapp.com/?reviewId=b5b833a9-54af-4c44-a535-5f44ee8748dd&source=game-summary

Happened once when I played Nguen (aka Panda) and selected Tamsin’s HP to consume my Scallywag. Somehow that destroyed the Start of Combat stack and prevented Flagbearers from triggering.

@Thinker, were you playing Tamsin as well?