Bug in live chess

Live chess wont claim draw by insufficient material in K+2 same color bishops vs K

After I played f8=B on move 201 it should have claimed draw

Link : www.chess.com/livechess/game?id=823365617

You intentionately aimed for that bug 

        Enlighten us, please. What was the point in promoting to a black square bishop?

To check if there would be a bug of course.

You can still checkmayte with 2 bichops, but not with 2 same coloured ones.

Truth Table:

BISH1   BISH2   RESULT
white   white   draw
white   black   win
black    white   win
black    black   draw

You will learn about truth tables if you decide to study computer science or mathematic probably also electronic - but you get the idea now.

        The question of why a draw on insufficient material was not declared remains, I suppose.