When completing Solo Ops above light level 300, the end chest will only drop one reward unless all objectives are complete, regardless of the score threshold. This has been witnessed on multiple accounts, including my own. The player sets their rewards forecast to A-tier and completes the activity as normal. If the bonus objective is not complete, the ending chest does not drop the expected rewards even if the player achieves a score above the threshold for A-tier rewards (through the time bonus). I assume the expected behavior is that, if a player achieves a score above the threshold with the regular objectives and the time bonus, that they are meant to receive bonus rewards. This is not the case - the score monitor on the lower right will not glow the expected orange color (even if the score lists as 10101) staying grey, and the chest will drop a single reward. After this, the score summary on the bottom of the screen will show C+ rewards, not only inconsistent with the score monitor but also inconsistent with the set power level, the active modifiers, and the resulting score forecast.