I started the game again because I lost my saves ( I was at about cycle 15-16) and since I now know a lot more about how the game works I played it a lot better, however I seem to have bugged the game with my "speedrun" second playthrough.

I'm not sure what caused the bug but I will explain how I played and what bugged.
First of all I ignored sister deaths requests to kill the first predators that appeared, and instead opened both her hearts as fast as I could, then I opened Uta's and Ava's first heart, I opened Uta's first I think in cycle 4 or 5 before any of the brothers showed up.
After opening Uta's I went to the pangolin chamber and grabbed magnet, I couldn't get the other heart on the branch because the pangolin would snatch up and eat me.

I'm now in cycle 7 and warden told me to go kill the pangolin, I went there but the heart on the middle branch is no longer there.

Did I ruin my chances of finishing the game?

Any suggestions on how I can fix this?

Any way I can cheat to get the heart that was on the branch?

This will not preventyou from finishing the game - there are more ways to get missing hearts after cycle 20.

Any idea why it happened? Is the heart that disappeared random or was a specific heart there?