The authors conducted an acceptability judgment experiment on German complex antecedent multiple sluicing (caMS) configurations in which a full or short source interpretation was forced through manipulating the morphological case-marking on the sluiced wh-phrases. The results show that full source caMS is significantly less acceptable than short source caMS, regardless of whether the subject of the embedded clause co-refers with an expression in the matrix clause (stable) or not (shifty). The authors interpret these results as showing that (i) short source caMS exists (following Abels & Dayal 2017, 2022) and (ii) full source caMS always violates the Clausemate Condition (CC), which incurs an acceptability penalty. This latter claim stands in opposition to Barros & Frank (2022), who propose that the CC is suspended in full source caMS with a stable embedded clause subject. The authors also report informally collected judgments from 8 native speakers of English that cast doubts on the validity of the evidence from English that Barros & Frank employ to support their proposal.