Guardian's Bastion of Hope and Ascendant's Guardian - Block interaction

Edit: All this may actually be entirely due to the way the game downscales characters with a level difference. It didn't occur to us at the time, but we noticed the block chance behavior returning to normal in a higher level zone. If that's indeed the case, everyone can safely ignore this post...

Both of these ascendancy passives grant bonuses to attack and spell block after having attacked or cast a spell, respectively. However, when characters with both passives are placed in a party, the Guardian's Bastion of Hope no longer functions correctly on the Scion.

With the Ascendant's Guardian passive allocated, the Guardian's Bastion of Hope seems to change from adding +25% Attack Block to instead grant +6% Attack Block on the Scion.

ex: A Scion with 24% base attack block becomes 30% attack block (24 + 6), rather than 49%. With 0% base attack block chance, it becomes 6%, rather than 25%. Unspeccing the Scion's Guardian node returns the behavior to normal and you correctly get +25% attack block chance (for a total of 49% in this example.)

Spell block also behaves incorrectly, with Bastion of Hope granting 6% spell block to a Scion with 0% base spell block. To further test this, we increased this to 12% with a Stone of Lazhwar. With 12% base spell block, Bastion of Hope increased it to 18% spell block.

In our testing, we were able to get the passives to interact correctly in our hideouts after a combination of unspeccing/respeccing the Ascendant's Guardian passive and equipping the amulet with spell block chance. However, when traveling to any new zone, the behavior returns to the erroneous +6%. Bizarrely, we were also able to get the bugged behavior to persist after unspeccing the Ascendant's Guardian passive while in a campaign zone and after changing zones several times.

It's worth noting that all this works correctly on the Guardian's side. The Scion grants +10% attack/spell block and Bastion of Hope overwrites it with the stronger 25% attack/spell block.

In the case of the Scion, their +10% buff from their ascendancy overwrites the weaker 6% from the Guardian.

It's difficult to determine if this is a Character Sheet bug or if the block buff is truly being applied incorrectly.