Hey I have a full set of Master Corrupting Echo gear from GoA it has been broken for some time now at first all the bonus slots got removed by a bad patch. Then a new patch returned the slots to head hands and class item.
But my boots and chest piece Are still broken
And missing the extra slot. Even though the tool tip says it's there I can't interact with it or slot anything been like this for a while I'm still waiting for help with this issue.
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Unfortunately, until Bungie put out the patch that has the fix for the slot you're stuck without it on that pieces.