Can you please check if the report on the descendant class is checked or not?
By default, Pega includes pxobjclass as the current class on the SQL query as "PC0"."pxobjclass" LIKE ?
This option is useful to include specific classes from the workpool or report created on the Framework layer. If Report on descendant class instances is selected, you can choose to include only the implementation class or all descendant classes (all framework and implementation classes).
The filter condition on pxobjclass changed to "PC0"."pxobjclass" IN (? , ? , ? , ? , ? , ? , ? , ? ), where ? depends upon the number of descendant classes. You can select a specific subset of descendant classes to include or exclude by adding a filter condition on .pxObjClass.