In blueprint graphs, the action list for soft object references of a Object subclass is incorrect. "Equal" spawns an incompatible node, while the expected "Equal (SoftObjectReference)" is missing. "Not Equal" has the same issue.
It works correctly for soft object references of type Object, but breaks on subclasses such as Actor.
Repro steps #1:
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-162876 in the post.