Minions attack you in a bush with no vision
In game when i decided it was time for me to back i entered a bush in top lane and started my back channel. when the enemy wave started pushing up while i was inside the bush they started turning and attacking me, canceling my back.
during a brief interaction with the enemy team and after reviewing the replay video, that bush as indeed not warded at all which means the enemy team had no vision on me according to the game.
i have uploaded a clip regarding that issue as well.