Can not find abstract class in actor class dropdown list in GetAllActorsOfClass node

The behavior of non-variable class pins has changed in 4.26 where abstract classes like AInfo are being excluded from class pickers for general utility functions like GetAllActorsOfClass. This is not intentional, it was only intended to hide abstract classes from pins like Set that directly modify class variables.

1 Add a custom c++ class with Abstract in its class specifier

2 Add the GetAllActorsOfClass node in BP, in the Actor Class dropdown list, one cannot find the custom class (or an engine class like Info)

Expected Result: the custom class shows up in the dropdown list, which is the default behavior before 4.26.