Cannot "ignore unresolved reference".

I'm wondering why I can't choose to "ignore unresolved reference" for some unresolved reference errors. (PyCharm Pro 2019.3). All it will let me do is disable PyUnresolvedReferences wholesale for the line/function/module etc. Also if I add zmq.SUB and zmq.SUBSCRIBE to the list of unresolved references to ignore in Settings, it still gives the warning.

ref. https://intellij-support.jetbrains.com/hc/en-us/community/posts/115000784390-Inspection-support-for-modules-with-dynamically-added-attributes