Suppression state makes sense only in context of given LOD.
Assembly may have several LODs., and the specific occurrence
may be suppressed in one LOD and unsuppressed in others.
So to check occurrences suppression state you have
to get access to the assembly in desired LOD.
You may do it faster if you open the assembly document
(in given LOD) in hidden mode, check suppression status
and then close assembly.
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