Mist Play Buddy

Lately, I feel like I've been encountering more situations where, just when I'm 1 or 2 clears away from a treasure chest, my buddy clears it first, cuts our buddy status, and I haven't even received my reward yet. I've been clearing 5 games daily and steadily accumulating them, while the other person had 0 to maybe 1 clear, and they just snatch the rewards. My impression of them is the worst. I honestly wish there was a block feature. To anyone who teamed up with Zattani: If you don't cut the buddy status, we can reach the 3rd reward, so please don't cut it (excluding AFKs).