'Meaning of "previous in system / Context" Chrome DevTools

I was inspecting the Memory Summary of a Heap Snapshot of my node.js application in Chrome DevTools and found a leaked object to be reachable via previous in system / Context @266607. Can anybody explain what that means, exactly? I understand what context means in this case, but for previousI could not find any documentation. To be clear, I mean this kind of graph:

I am talking about this type of inspector

node.jsgoogle-chromememory-leaksdevtools


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