2000Gi didn't schedule - "insufficient storage; tags not fulfilled".
The cp-3 HDD's real usable capacity (~3724GiB) minus paperless-media's
2000Gi and ~231GiB of other apps' default-class replicas that Longhorn
placed here anyway (tags only pull matching volumes in, don't exclude
others when the untagged pool elsewhere is full) only leaves ~1493Gi
of real scheduling headroom. 1400Gi fits with margin.