It is not a bug, the following change has been made in the game on 02.10.2013: If the difference between the value/gold equivalent of the attacker's army and defender's net points' gold equivalent is drastic, the Premium extras of the defender will not be locked under attack.
When I got attack from any player , I can donate resource for alliance and i can recruit fast army with diamonds and i can always open temple ( WITH DIAMONDS ARMYS'S ) and i can fast transfer my army to other provinces with reached immediately button under the attack... I MEAN I CAN DO ALL THING UNDER THE ATTACK.....
You can use Premium extras like instant army transport to the provinces, instant research, donate resources etc. when the attacker sends smaller army compared to your economical development at that moment (net points of the Empire). Bonnie77 attacked your Empire with small army on 28-09-2014 19:15 h and you were allowed to use options which are usually locked under attack.