A1 Mini BMCU (01.07.02.00) and P1S Standard AMS (00.00.06.75) always
report tray.state=3, even for loaded configured slots. The empty-slot
detection preferred state==11 with tray_type as a fallback only when
state was absent, so every assign was classified as empty and MQTT
was skipped — both for "assign to unconfigured slot" and the secondary
"PETG over a PLA-configured slot won't reconfigure" symptom.
Empty-slot detection in the assign route and the on_ams_change replay
now treats the slot as loaded when EITHER state==11 OR tray_type is
non-empty. Reset-slot case (state=11 + tray_type="") still works
through the first clause; configured slots on these firmwares now
work through the second.
Truly empty unconfigured slots (state!=11 + tray_type="") still hit
the pending-config path, and the deferred publish now fires when the
user later configures the slot in Bambu Studio (tray_type goes
non-empty), since the replay uses the same disjunction.