+ // It's suboptimal that we don't support callbacks returning ##f,
+ // but this makes beams have no effect on "stems" reliably in
+ // TabStaff when \tabFullNotation is switched off: the real stencil
+ // callback for beams is called quite late in the process, and we
+ // don't want to trigger it early.
+ if (scm_is_false (beam_->get_property_data ("stencil")))
+ return;
+