Strongbox Quantity, based on Atlas Passives

I have played for a while now so that I can fairly confidently say this:

When picking the "Old Pirate's Trick" node on the Atlas tree whilst having all the "Strongbox Chance" small nodes active as well, you get exactly one strongbox per map very often.

If you turn off the "Old Pirate's Trick" node while the small strongbox nodes are all active, you see 2 strongboxes way more often.

It feels like the "Old Pirate's Trick" node deactivates the smaller strongbox nodes. I am thinking it should work IN ADDITION to them, giving you even more strongboxes. If that is indeed the intention of that node, I don't think it is working properly right now.