In RFC-212 we adopted turning on the "junk suppression" temporary local background subtraction by default: SourceDetectionConfig.doTempLocalBackground=True. Since the safe clipping coadd assembly (introduced in DM-2915) also performs object detection, this had the effect of turning on the junk suppression background there too. The safe clipping algorithm was designed and tuned with no extra background estimations, thus doTempLocalBackground should default to False for that task.