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Swapping a Bambu spool for one the AMS cannot read left Assign Spool publishing no ams_filament_setting at all. The printer kept showing "?" on its screen and in the slicer, and only Configure, which publishes unconditionally, put anything there. Four places asked the tray's `state` field whether a spool was in the slot. It cannot answer that. An AMS-HT reports its LOADED tray as 9 rather than 11, because it does not feed into a shared buffer the way a 4-slot AMS does -- the merge has skipped its own state heuristic for HT units since #2594 for exactly this reason. And the field is partly our own writing: apply_tray_exist_bits stamps state=9 on every slot whose tray_exist_bits bit is 0, and when the bit comes back it refreshes only the `exists` annotation beside it. Either way the slot sits at exists=True, state=9 until something configures it. That 9 also kept the deferred-configuration replay from firing -- its own "has a spool appeared" test was the same heuristic -- which is the deadlock #1322 removed from the assign path, still in place one step further along. And it is what deleted the assignments in #3100: with the replay never firing, the row kept the empty fingerprint it was stored with, and the first tray report naming a filament was read as a swap. All four now read tray_exist_bits first, which is the mask firmware answers this question with and the one the printer card has drawn its "?" from since #2527. The bit is allowed to overrule an "empty" state and nothing else: a bit reading empty deliberately does not start suppressing pushes that go out today, because the cost of computing a bit position wrong is a slot that silently stops configuring, against a saving of one message firmware would have dropped. A blank tray report from a slot the bit calls occupied no longer unlinks anything, off a print as well as during one, in both inventory modes -- Spoolman's parse_ams_tray calls a tray with no type empty, so a tag-less spool assigned through the UI had its row deleted by the first idle push after it went in. A filament the AMS cannot identify is not a filament that was removed.