H2S firmware reports tray_now=0 (the AMS's idle slot) throughout
external-spool prints instead of 254 like X1C/P1S/A1 do, so the
single-nozzle branch's 0-3 passthrough landed state.tray_now on slot
0 — UI highlighted AMS SLOT 1 instead of the external spool.
Usage credit was unaffected (#1276 covers that via ams_mapping).
The single-nozzle branch now checks _captured_ams_mapping (slicer-
captured per-filament mapping that the request-topic intercept
already tracks) before the existing P2S multi-AMS resolver. When
every entry is -1, the print uses ONLY the external spool, so
state.tray_now is promoted to 254.
Narrow on purpose: AMS-only [5] and mixed [5, -1] are NOT
overridden — we have no evidence H2S misreports mid-print swaps, and
trusting the firmware preserves correctness for users with multi-
filament setups. No-mapping prints (printer-screen start) fall
through unchanged.
maziggy
4b0150b0ec