Nicol Bolas, God-Pharoah vanguard doesn't give mana with second ability

Machine

The vanguard mentioned in the subject doesn't give mana when the creature that became exiled was disabled. In my case, the creature was disabled by Suppression Bonds. I was able to reproduce with 100% accuracy with subsequent disabled creatures. The vanguard gave mana as described by its text when the opposing creature was not disabled.