Raging Spirits and Minion Duration

Allocating neither "Expendable Army" notable nor 12% minion duration node adjacent does increase the spirit duration in Raging Spirits gem preview panel. I wasn't able to measure whether they actually last longer.
One anomaly is that I allocated those passives with no connection to the tree, with From Nothing jewel enabling passives in radius of Ancestral Bond keystone. However I was able to determine that Expendable Army's increase to limit of temporary minions does take effect.
Additionally, inserting Prolonged Duration II support gem does increase spirit duration in the gem panel, albeit without taking into account the increase from the aforementioned passives. It goes from 5s to 6.75s, not to 9.18s expected if those passives were included.

Therefore either Raging Spirits don't benefit from minion duration correctly, or the modified minion duration is not reflected correctly in the gem panel.