DM-13493 removed interpolated_flag from the badFlags list in BaseSourceSelectorTask, but did not remove it from BaseStarSelectorTask. Removing it from starSelector results in the dm_stack_demo failing because the sources change. In order to finish unifying the starSelectors, we have do decide how to properly manage this change.
One option would be to append interpolated_flag to badFlags in objectSizeSS and any other "only select PSF sources" starSelectors (i.e. "true" starSelectors, instead of sourceSelectors). That at least would keep the status quo.